diff options
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/checkpatch.pl | 2644 | ||||
| -rw-r--r-- | scripts/const_structs.checkpatch | 2 |
2 files changed, 2224 insertions, 422 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 3afc870f0f2..2287a0bca86 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -1,4 +1,4 @@ -#!/usr/bin/perl -w +#!/usr/bin/env perl # (c) 2001, Dave Jones. (the file handling bit) # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit) # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite) @@ -6,12 +6,13 @@ # Licensed under the terms of the GNU GPL License version 2 use strict; +use warnings; use POSIX; use File::Basename; use Cwd 'abs_path'; +use Term::ANSIColor qw(:constants); my $P = $0; -$P =~ s@.*/@@g; my $D = dirname(abs_path($P)); my $V = '0.32'; @@ -25,12 +26,17 @@ my $chk_patch = 1; my $tst_only; my $emacs = 0; my $terse = 0; +my $showfile = 0; my $file = 0; +my $git = 0; +my %git_commits = (); my $check = 0; +my $check_orig = 0; my $summary = 1; my $mailback = 0; my $summary_file = 0; my $show_types = 0; +my $list_types = 0; my $fix = 0; my $fix_inplace = 0; my $root; @@ -45,9 +51,14 @@ my $configuration_file = ".checkpatch.conf"; my $max_line_length = 80; my $ignore_perl_version = 0; my $minimum_perl_version = 5.10.0; +my $min_conf_desc_length = 4; my $spelling_file = "$D/spelling.txt"; my $codespell = 0; my $codespellfile = "/usr/share/codespell/dictionary.txt"; +my $conststructsfile = "$D/const_structs.checkpatch"; +my $typedefsfile = ""; +my $color = "auto"; +my $allow_c99_comments = 1; sub help { my ($exitcode) = @_; @@ -63,12 +74,25 @@ Options: --patch treat FILE as patchfile (default) --emacs emacs compile window format --terse one line per report + --showfile emit diffed file position, not input file position + -g, --git treat FILE as a single commit or git revision range + single git commit with: + <rev> + <rev>^ + <rev>~n + multiple git commits with: + <rev1>..<rev2> + <rev1>...<rev2> + <rev>-<count> + git merges are ignored -f, --file treat FILE as regular source file --subjective, --strict enable more subjective tests + --list-types list the possible message types --types TYPE(,TYPE2...) show only these comma separated message types --ignore TYPE(,TYPE2...) ignore various comma separated message types + --show-types show the specific message type in the output --max-line-length=n set the maximum line length, if exceeded, warn - --show-types show the message "types" in the output + --min-conf-desc-length=n set the min description length, if shorter, warn --root=PATH PATH to the kernel tree root --no-summary suppress the per-file summary --mailback only produce a report in case of warnings/errors @@ -89,8 +113,11 @@ Options: --ignore-perl-version override checking of perl version. expect runtime errors. --codespell Use the codespell dictionary for spelling/typos - (default:/usr/local/share/codespell/dictionary.txt) + (default:/usr/share/codespell/dictionary.txt) --codespellfile Use this codespell dictionary + --typedefsfile Read additional types from this file + --color[=WHEN] Use colors 'always', 'never', or only when output + is a terminal ('auto'). Default is 'auto'. -h, --help, --version display this help and exit When FILE is - read standard input. @@ -99,6 +126,37 @@ EOM exit($exitcode); } +sub uniq { + my %seen; + return grep { !$seen{$_}++ } @_; +} + +sub list_types { + my ($exitcode) = @_; + + my $count = 0; + + local $/ = undef; + + open(my $script, '<', abs_path($P)) or + die "$P: Can't read '$P' $!\n"; + + my $text = <$script>; + close($script); + + my @types = (); + for ($text =~ /\b(?:(?:CHK|WARN|ERROR)\s*\(\s*"([^"]+)")/g) { + push (@types, $_); + } + @types = sort(uniq(@types)); + print("#\tMessage type\n\n"); + foreach my $type (@types) { + print(++$count . "\t" . $type . "\n"); + } + + exit($exitcode); +} + my $conf = which_conf($configuration_file); if (-f $conf) { my @conf_args; @@ -125,6 +183,14 @@ if (-f $conf) { unshift(@ARGV, @conf_args) if @conf_args; } +# Perl's Getopt::Long allows options to take optional arguments after a space. +# Prevent --color by itself from consuming other arguments +foreach (@ARGV) { + if ($_ eq "--color" || $_ eq "-color") { + $_ = "--color=$color"; + } +} + GetOptions( 'q|quiet+' => \$quiet, 'tree!' => \$tree, @@ -132,13 +198,17 @@ GetOptions( 'patch!' => \$chk_patch, 'emacs!' => \$emacs, 'terse!' => \$terse, + 'showfile!' => \$showfile, 'f|file!' => \$file, + 'g|git!' => \$git, 'subjective!' => \$check, 'strict!' => \$check, 'ignore=s' => \@ignore, 'types=s' => \@use, 'show-types!' => \$show_types, + 'list-types!' => \$list_types, 'max-line-length=i' => \$max_line_length, + 'min-conf-desc-length=i' => \$min_conf_desc_length, 'root=s' => \$root, 'summary!' => \$summary, 'mailback!' => \$mailback, @@ -148,15 +218,22 @@ GetOptions( 'ignore-perl-version!' => \$ignore_perl_version, 'debug=s' => \%debug, 'test-only=s' => \$tst_only, - 'codespell!' => \$codespell, - 'codespellfile=s' => \$codespellfile, + 'codespell!' => \$codespell, + 'codespellfile=s' => \$codespellfile, + 'typedefsfile=s' => \$typedefsfile, + 'color=s' => \$color, + 'no-color' => \$color, #keep old behaviors of -nocolor + 'nocolor' => \$color, #keep old behaviors of -nocolor 'h|help' => \$help, 'version' => \$help ) or help(1); help(0) if ($help); +list_types(0) if ($list_types); + $fix = 1 if ($fix_inplace); +$check_orig = $check; my $exit = 0; @@ -167,9 +244,21 @@ if ($^V && $^V lt $minimum_perl_version) { } } +#if no filenames are given, push '-' to read patch from stdin if ($#ARGV < 0) { - print "$P: no input files\n"; - exit(1); + push(@ARGV, '-'); +} + +if ($color =~ /^[01]$/) { + $color = !$color; +} elsif ($color =~ /^always$/i) { + $color = 1; +} elsif ($color =~ /^never$/i) { + $color = 0; +} elsif ($color =~ /^auto$/i) { + $color = (-t STDOUT); +} else { + die "Invalid color mode: $color\n"; } sub hash_save_array_words { @@ -192,12 +281,12 @@ sub hash_save_array_words { sub hash_show_words { my ($hashRef, $prefix) = @_; - if ($quiet == 0 && keys %$hashRef) { - print "NOTE: $prefix message types:"; + if (keys %$hashRef) { + print "\nNOTE: $prefix message types:"; foreach my $word (sort keys %$hashRef) { print " $word"; } - print "\n\n"; + print "\n"; } } @@ -257,7 +346,8 @@ our $Sparse = qr{ __init_refok| __kprobes| __ref| - __rcu + __rcu| + __private }x; our $InitAttributePrefix = qr{__(?:mem|cpu|dev|net_|)}; our $InitAttributeData = qr{$InitAttributePrefix(?:initdata\b)}; @@ -272,7 +362,7 @@ our $Attribute = qr{ __percpu| __nocast| __safe| - __bitwise__| + __bitwise| __packed__| __packed2__| __naked| @@ -281,6 +371,7 @@ our $Attribute = qr{ __noreturn| __used| __cold| + __pure| __noclone| __deprecated| __read_mostly| @@ -292,7 +383,7 @@ our $Attribute = qr{ __weak }x; our $Modifier; -our $Inline = qr{inline|__always_inline|noinline}; +our $Inline = qr{inline|__always_inline|noinline|__inline|__inline__}; our $Member = qr{->$Ident|\.$Ident|\[[^]]*\]}; our $Lval = qr{$Ident(?:$Member)*}; @@ -300,13 +391,15 @@ our $Int_type = qr{(?i)llu|ull|ll|lu|ul|l|u}; our $Binary = qr{(?i)0b[01]+$Int_type?}; our $Hex = qr{(?i)0x[0-9a-f]+$Int_type?}; our $Int = qr{[0-9]+$Int_type?}; +our $Octal = qr{0[0-7]+$Int_type?}; +our $String = qr{"[X\t]*"}; our $Float_hex = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]?}; our $Float_dec = qr{(?i)(?:[0-9]+\.[0-9]*|[0-9]*\.[0-9]+)(?:e-?[0-9]+)?[fl]?}; our $Float_int = qr{(?i)[0-9]+e-?[0-9]+[fl]?}; our $Float = qr{$Float_hex|$Float_dec|$Float_int}; -our $Constant = qr{$Float|$Binary|$Hex|$Int}; +our $Constant = qr{$Float|$Binary|$Octal|$Hex|$Int}; our $Assignment = qr{\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=}; -our $Compare = qr{<=|>=|==|!=|<|>}; +our $Compare = qr{<=|>=|==|!=|<|(?<!-)>}; our $Arithmetic = qr{\+|-|\*|\/|%}; our $Operators = qr{ <=|>=|==|!=| @@ -314,10 +407,16 @@ our $Operators = qr{ &&|\|\||,|\^|\+\+|--|&|\||$Arithmetic }x; +our $c90_Keywords = qr{do|for|while|if|else|return|goto|continue|switch|default|case|break}x; + +our $BasicType; our $NonptrType; +our $NonptrTypeMisordered; our $NonptrTypeWithAttr; our $Type; +our $TypeMisordered; our $Declare; +our $DeclareMisordered; our $NON_ASCII_UTF8 = qr{ [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte @@ -334,19 +433,28 @@ our $UTF8 = qr{ | $NON_ASCII_UTF8 }x; -our $typeTypedefs = qr{(?x: +our $typeC99Typedefs = qr{(?:__)?(?:[us]_?)?int_?(?:8|16|32|64)_t}; +our $typeOtherOSTypedefs = qr{(?x: + u_(?:char|short|int|long) | # bsd + u(?:nchar|short|int|long) # sysv +)}; +our $typeKernelTypedefs = qr{(?x: (?:__)?(?:u|s|be|le)(?:8|16|32|64)| atomic_t )}; +our $typeTypedefs = qr{(?x: + $typeC99Typedefs\b| + $typeOtherOSTypedefs\b| + $typeKernelTypedefs\b +)}; + +our $zero_initializer = qr{(?:(?:0[xX])?0+$Int_type?|NULL|false)\b}; our $logFunctions = qr{(?x: - printk(?:_ratelimited|_once|)| + printk(?:_ratelimited|_once|_deferred_once|_deferred|)| (?:[a-z0-9]+_){1,2}(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)| WARN(?:_RATELIMIT|_ONCE|)| panic| - debug| - printf| - puts| MODULE_[A-Z_]+| seq_vprintf|seq_printf|seq_puts )}; @@ -362,16 +470,36 @@ our $signature_tags = qr{(?xi: Cc: )}; +our @typeListMisordered = ( + qr{char\s+(?:un)?signed}, + qr{int\s+(?:(?:un)?signed\s+)?short\s}, + qr{int\s+short(?:\s+(?:un)?signed)}, + qr{short\s+int(?:\s+(?:un)?signed)}, + qr{(?:un)?signed\s+int\s+short}, + qr{short\s+(?:un)?signed}, + qr{long\s+int\s+(?:un)?signed}, + qr{int\s+long\s+(?:un)?signed}, + qr{long\s+(?:un)?signed\s+int}, + qr{int\s+(?:un)?signed\s+long}, + qr{int\s+(?:un)?signed}, + qr{int\s+long\s+long\s+(?:un)?signed}, + qr{long\s+long\s+int\s+(?:un)?signed}, + qr{long\s+long\s+(?:un)?signed\s+int}, + qr{long\s+long\s+(?:un)?signed}, + qr{long\s+(?:un)?signed}, +); + our @typeList = ( qr{void}, - qr{(?:unsigned\s+)?char}, - qr{(?:unsigned\s+)?short}, - qr{(?:unsigned\s+)?int}, - qr{(?:unsigned\s+)?long}, - qr{(?:unsigned\s+)?long\s+int}, - qr{(?:unsigned\s+)?long\s+long}, - qr{(?:unsigned\s+)?long\s+long\s+int}, - qr{unsigned}, + qr{(?:(?:un)?signed\s+)?char}, + qr{(?:(?:un)?signed\s+)?short\s+int}, + qr{(?:(?:un)?signed\s+)?short}, + qr{(?:(?:un)?signed\s+)?int}, + qr{(?:(?:un)?signed\s+)?long\s+int}, + qr{(?:(?:un)?signed\s+)?long\s+long\s+int}, + qr{(?:(?:un)?signed\s+)?long\s+long}, + qr{(?:(?:un)?signed\s+)?long}, + qr{(?:un)?signed}, qr{float}, qr{double}, qr{bool}, @@ -381,7 +509,31 @@ our @typeList = ( qr{${Ident}_t}, qr{${Ident}_handler}, qr{${Ident}_handler_fn}, + @typeListMisordered, ); + +our $C90_int_types = qr{(?x: + long\s+long\s+int\s+(?:un)?signed| + long\s+long\s+(?:un)?signed\s+int| + long\s+long\s+(?:un)?signed| + (?:(?:un)?signed\s+)?long\s+long\s+int| + (?:(?:un)?signed\s+)?long\s+long| + int\s+long\s+long\s+(?:un)?signed| + int\s+(?:(?:un)?signed\s+)?long\s+long| + + long\s+int\s+(?:un)?signed| + long\s+(?:un)?signed\s+int| + long\s+(?:un)?signed| + (?:(?:un)?signed\s+)?long\s+int| + (?:(?:un)?signed\s+)?long| + int\s+long\s+(?:un)?signed| + int\s+(?:(?:un)?signed\s+)?long| + + int\s+(?:un)?signed| + (?:(?:un)?signed\s+)?int +)}; + +our @typeListFile = (); our @typeListWithAttr = ( @typeList, qr{struct\s+$InitAttribute\s+$Ident}, @@ -391,10 +543,67 @@ our @typeListWithAttr = ( our @modifierList = ( qr{fastcall}, ); +our @modifierListFile = (); + +our @mode_permission_funcs = ( + ["module_param", 3], + ["module_param_(?:array|named|string)", 4], + ["module_param_array_named", 5], + ["debugfs_create_(?:file|u8|u16|u32|u64|x8|x16|x32|x64|size_t|atomic_t|bool|blob|regset32|u32_array)", 2], + ["proc_create(?:_data|)", 2], + ["(?:CLASS|DEVICE|SENSOR|SENSOR_DEVICE|IIO_DEVICE)_ATTR", 2], + ["IIO_DEV_ATTR_[A-Z_]+", 1], + ["SENSOR_(?:DEVICE_|)ATTR_2", 2], + ["SENSOR_TEMPLATE(?:_2|)", 3], + ["__ATTR", 2], +); + +#Create a search pattern for all these functions to speed up a loop below +our $mode_perms_search = ""; +foreach my $entry (@mode_permission_funcs) { + $mode_perms_search .= '|' if ($mode_perms_search ne ""); + $mode_perms_search .= $entry->[0]; +} + +our $mode_perms_world_writable = qr{ + S_IWUGO | + S_IWOTH | + S_IRWXUGO | + S_IALLUGO | + 0[0-7][0-7][2367] +}x; + +our %mode_permission_string_types = ( + "S_IRWXU" => 0700, + "S_IRUSR" => 0400, + "S_IWUSR" => 0200, + "S_IXUSR" => 0100, + "S_IRWXG" => 0070, + "S_IRGRP" => 0040, + "S_IWGRP" => 0020, + "S_IXGRP" => 0010, + "S_IRWXO" => 0007, + "S_IROTH" => 0004, + "S_IWOTH" => 0002, + "S_IXOTH" => 0001, + "S_IRWXUGO" => 0777, + "S_IRUGO" => 0444, + "S_IWUGO" => 0222, + "S_IXUGO" => 0111, +); + +#Create a search pattern for all these strings to speed up a loop below +our $mode_perms_string_search = ""; +foreach my $entry (keys %mode_permission_string_types) { + $mode_perms_string_search .= '|' if ($mode_perms_string_search ne ""); + $mode_perms_string_search .= $entry; +} our $allowed_asm_includes = qr{(?x: irq| - memory + memory| + time| + reboot )}; # memory.h: ARM has a custom one @@ -447,12 +656,54 @@ if ($codespell) { $misspellings = join("|", sort keys %spelling_fix) if keys %spelling_fix; +sub read_words { + my ($wordsRef, $file) = @_; + + if (open(my $words, '<', $file)) { + while (<$words>) { + my $line = $_; + + $line =~ s/\s*\n?$//g; + $line =~ s/^\s*//g; + + next if ($line =~ m/^\s*#/); + next if ($line =~ m/^\s*$/); + if ($line =~ /\s/) { + print("$file: '$line' invalid - ignored\n"); + next; + } + + $$wordsRef .= '|' if ($$wordsRef ne ""); + $$wordsRef .= $line; + } + close($file); + return 1; + } + + return 0; +} + +my $const_structs = ""; +read_words(\$const_structs, $conststructsfile) + or warn "No structs that should be const will be found - file '$conststructsfile': $!\n"; + +my $typeOtherTypedefs = ""; +if (length($typedefsfile)) { + read_words(\$typeOtherTypedefs, $typedefsfile) + or warn "No additional types will be considered - file '$typedefsfile': $!\n"; +} +$typeTypedefs .= '|' . $typeOtherTypedefs if ($typeOtherTypedefs ne ""); sub build_types { - my $mods = "(?x: \n" . join("|\n ", @modifierList) . "\n)"; - my $all = "(?x: \n" . join("|\n ", @typeList) . "\n)"; + my $mods = "(?x: \n" . join("|\n ", (@modifierList, @modifierListFile)) . "\n)"; + my $all = "(?x: \n" . join("|\n ", (@typeList, @typeListFile)) . "\n)"; + my $Misordered = "(?x: \n" . join("|\n ", @typeListMisordered) . "\n)"; my $allWithAttr = "(?x: \n" . join("|\n ", @typeListWithAttr) . "\n)"; $Modifier = qr{(?:$Attribute|$Sparse|$mods)}; + $BasicType = qr{ + (?:$typeTypedefs\b)| + (?:${all}\b) + }x; $NonptrType = qr{ (?:$Modifier\s+|const\s+)* (?: @@ -462,6 +713,13 @@ sub build_types { ) (?:\s+$Modifier|\s+const)* }x; + $NonptrTypeMisordered = qr{ + (?:$Modifier\s+|const\s+)* + (?: + (?:${Misordered}\b) + ) + (?:\s+$Modifier|\s+const)* + }x; $NonptrTypeWithAttr = qr{ (?:$Modifier\s+|const\s+)* (?: @@ -473,10 +731,16 @@ sub build_types { }x; $Type = qr{ $NonptrType - (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*|\[\])+|(?:\s*\[\s*\])+)? + (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)? + (?:\s+$Inline|\s+$Modifier)* + }x; + $TypeMisordered = qr{ + $NonptrTypeMisordered + (?:(?:\s|\*|\[\])+\s*const|(?:\s|\*\s*(?:const\s*)?|\[\])+|(?:\s*\[\s*\])+)? (?:\s+$Inline|\s+$Modifier)* }x; - $Declare = qr{(?:$Storage\s+)?$Type}; + $Declare = qr{(?:$Storage\s+(?:$Inline\s+)?)?$Type}; + $DeclareMisordered = qr{(?:$Storage\s+(?:$Inline\s+)?)?$TypeMisordered}; } build_types(); @@ -487,15 +751,26 @@ our $Typecast = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*}; # Any use must be runtime checked with $^V our $balanced_parens = qr/(\((?:[^\(\)]++|(?-1))*\))/; -our $LvalOrFunc = qr{($Lval)\s*($balanced_parens{0,1})\s*}; -our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)}; +our $LvalOrFunc = qr{((?:[\&\*]\s*)?$Lval)\s*($balanced_parens{0,1})\s*}; +our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant|$String)}; + +our $declaration_macros = qr{(?x: + (?:$Storage\s+)?(?:[A-Z_][A-Z0-9]*_){0,2}(?:DEFINE|DECLARE)(?:_[A-Z0-9]+){1,6}\s*\(| + (?:$Storage\s+)?[HLP]?LIST_HEAD\s*\(| + (?:$Storage\s+)?${Type}\s+uninitialized_var\s*\( +)}; sub deparenthesize { my ($string) = @_; return "" if (!defined($string)); - $string =~ s@^\s*\(\s*@@g; - $string =~ s@\s*\)\s*$@@g; + + while ($string =~ /^\s*\(.*\)\s*$/) { + $string =~ s@^\s*\(\s*@@; + $string =~ s@\s*\)\s*$@@; + } + $string =~ s@\s+@ @g; + return $string; } @@ -525,6 +800,16 @@ sub seed_camelcase_file { } } +sub is_maintained_obsolete { + my ($filename) = @_; + + return 0 if (!$tree || !(-e "$root/scripts/get_maintainer.pl")); + + my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback -f $filename 2>&1`; + + return $status =~ /obsolete/i; +} + my $camelcase_seeded = 0; sub seed_camelcase_includes { return if ($camelcase_seeded); @@ -583,17 +868,82 @@ sub seed_camelcase_includes { } } +sub git_commit_info { + my ($commit, $id, $desc) = @_; + + return ($id, $desc) if ((which("git") eq "") || !(-e ".git")); + + my $output = `git log --no-color --format='%H %s' -1 $commit 2>&1`; + $output =~ s/^\s*//gm; + my @lines = split("\n", $output); + + return ($id, $desc) if ($#lines < 0); + + if ($lines[0] =~ /^error: short SHA1 $commit is ambiguous\./) { +# Maybe one day convert this block of bash into something that returns +# all matching commit ids, but it's very slow... +# +# echo "checking commits $1..." +# git rev-list --remotes | grep -i "^$1" | +# while read line ; do +# git log --format='%H %s' -1 $line | +# echo "commit $(cut -c 1-12,41-)" +# done + } elsif ($lines[0] =~ /^fatal: ambiguous argument '$commit': unknown revision or path not in the working tree\./) { + $id = undef; + } else { + $id = substr($lines[0], 0, 12); + $desc = substr($lines[0], 41); + } + + return ($id, $desc); +} + $chk_signoff = 0 if ($file); my @rawlines = (); my @lines = (); my @fixed = (); -my $vname; +my @fixed_inserted = (); +my @fixed_deleted = (); my $fixlinenr = -1; +# If input is git commits, extract all commits from the commit expressions. +# For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'. +die "$P: No git repository found\n" if ($git && !-e ".git"); + +if ($git) { + my @commits = (); + foreach my $commit_expr (@ARGV) { + my $git_range; + if ($commit_expr =~ m/^(.*)-(\d+)$/) { + $git_range = "-$2 $1"; + } elsif ($commit_expr =~ m/\.\./) { + $git_range = "$commit_expr"; + } else { + $git_range = "-1 $commit_expr"; + } + my $lines = `git log --no-color --no-merges --pretty=format:'%H %s' $git_range`; + foreach my $line (split(/\n/, $lines)) { + $line =~ /^([0-9a-fA-F]{40,40}) (.*)$/; + next if (!defined($1) || !defined($2)); + my $sha1 = $1; + my $subject = $2; + unshift(@commits, $sha1); + $git_commits{$sha1} = $subject; + } + } + die "$P: no git commits after extraction!\n" if (@commits == 0); + @ARGV = @commits; +} + +my $vname; for my $filename (@ARGV) { my $FILE; - if ($file) { + if ($git) { + open($FILE, '-|', "git format-patch -M --stdout -1 $filename") || + die "$P: $filename: git format-patch failed - $!\n"; + } elsif ($file) { open($FILE, '-|', "diff -u /dev/null $filename") || die "$P: $filename: diff failed - $!\n"; } elsif ($filename eq '-') { @@ -604,6 +954,8 @@ for my $filename (@ARGV) { } if ($filename eq '-') { $vname = 'Your patch'; + } elsif ($git) { + $vname = "Commit " . substr($filename, 0, 12) . ' ("' . $git_commits{$filename} . '")'; } else { $vname = $filename; } @@ -612,12 +964,45 @@ for my $filename (@ARGV) { push(@rawlines, $_); } close($FILE); + + if ($#ARGV > 0 && $quiet == 0) { + print '-' x length($vname) . "\n"; + print "$vname\n"; + print '-' x length($vname) . "\n"; + } + if (!process($filename)) { $exit = 1; } @rawlines = (); @lines = (); @fixed = (); + @fixed_inserted = (); + @fixed_deleted = (); + $fixlinenr = -1; + @modifierListFile = (); + @typeListFile = (); + build_types(); +} + +if (!$quiet) { + hash_show_words(\%use_type, "Used"); + hash_show_words(\%ignore_type, "Ignored"); + + if ($^V lt 5.10.0) { + print << "EOM" + +NOTE: perl $^V is not modern enough to detect all possible issues. + An upgrade to at least perl v5.10.0 is suggested. +EOM + } + if ($exit) { + print << "EOM" + +NOTE: If any of the errors are false positives, please report + them to the maintainer, see CHECKPATCH in MAINTAINERS. +EOM + } } exit($exit); @@ -709,6 +1094,18 @@ sub format_email { return $formatted_email; } +sub which { + my ($bin) = @_; + + foreach my $path (split(/:/, $ENV{PATH})) { + if (-e "$path/$bin") { + return "$path/$bin"; + } + } + + return ""; +} + sub which_conf { my ($conf) = @_; @@ -855,13 +1252,18 @@ sub sanitise_line { $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@; } + if ($allow_c99_comments && $res =~ m@(//.*$)@) { + my $match = $1; + $res =~ s/\Q$match\E/"$;" x length($match)/e; + } + return $res; } sub get_quoted_string { my ($line, $rawline) = @_; - return "" if ($line !~ m/(\"[X]+\")/g); + return "" if ($line !~ m/($String)/g); return substr($rawline, $-[0], $+[0] - $-[0]); } @@ -1470,13 +1872,13 @@ sub possible { for my $modifier (split(' ', $possible)) { if ($modifier !~ $notPermitted) { warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible); - push(@modifierList, $modifier); + push(@modifierListFile, $modifier); } } } else { warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible); - push(@typeList, $possible); + push(@typeListFile, $possible); } build_types(); } else { @@ -1487,34 +1889,144 @@ sub possible { my $prefix = ''; sub show_type { - return defined $use_type{$_[0]} if (scalar keys %use_type > 0); + my ($type) = @_; + + $type =~ tr/[a-z]/[A-Z]/; - return !defined $ignore_type{$_[0]}; + return defined $use_type{$type} if (scalar keys %use_type > 0); + + return !defined $ignore_type{$type}; } sub report { - if (!show_type($_[1]) || - (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) { + my ($level, $type, $msg) = @_; + + if (!show_type($type) || + (defined $tst_only && $msg !~ /\Q$tst_only\E/)) { return 0; } - my $line; + my $output = ''; + if ($color) { + if ($level eq 'ERROR') { + $output .= RED; + } elsif ($level eq 'WARNING') { + $output .= YELLOW; + } else { + $output .= GREEN; + } + } + $output .= $prefix . $level . ':'; if ($show_types) { - $line = "$prefix$_[0]:$_[1]: $_[2]\n"; - } else { - $line = "$prefix$_[0]: $_[2]\n"; + $output .= BLUE if ($color); + $output .= "$type:"; + } + $output .= RESET if ($color); + $output .= ' ' . $msg . "\n"; + + if ($showfile) { + my @lines = split("\n", $output, -1); + splice(@lines, 1, 1); + $output = join("\n", @lines); } - $line = (split('\n', $line))[0] . "\n" if ($terse); + $output = (split('\n', $output))[0] . "\n" if ($terse); - push(our @report, $line); + push(our @report, $output); return 1; } + sub report_dump { our @report; } +sub fixup_current_range { + my ($lineRef, $offset, $length) = @_; + + if ($$lineRef =~ /^\@\@ -\d+,\d+ \+(\d+),(\d+) \@\@/) { + my $o = $1; + my $l = $2; + my $no = $o + $offset; + my $nl = $l + $length; + $$lineRef =~ s/\+$o,$l \@\@/\+$no,$nl \@\@/; + } +} + +sub fix_inserted_deleted_lines { + my ($linesRef, $insertedRef, $deletedRef) = @_; + + my $range_last_linenr = 0; + my $delta_offset = 0; + + my $old_linenr = 0; + my $new_linenr = 0; + + my $next_insert = 0; + my $next_delete = 0; + + my @lines = (); + + my $inserted = @{$insertedRef}[$next_insert++]; + my $deleted = @{$deletedRef}[$next_delete++]; + + foreach my $old_line (@{$linesRef}) { + my $save_line = 1; + my $line = $old_line; #don't modify the array + if ($line =~ /^(?:\+\+\+|\-\-\-)\s+\S+/) { #new filename + $delta_offset = 0; + } elsif ($line =~ /^\@\@ -\d+,\d+ \+\d+,\d+ \@\@/) { #new hunk + $range_last_linenr = $new_linenr; + fixup_current_range(\$line, $delta_offset, 0); + } + + while (defined($deleted) && ${$deleted}{'LINENR'} == $old_linenr) { + $deleted = @{$deletedRef}[$next_delete++]; + $save_line = 0; + fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1); + } + + while (defined($inserted) && ${$inserted}{'LINENR'} == $old_linenr) { + push(@lines, ${$inserted}{'LINE'}); + $inserted = @{$insertedRef}[$next_insert++]; + $new_linenr++; + fixup_current_range(\$lines[$range_last_linenr], $delta_offset++, 1); + } + + if ($save_line) { + push(@lines, $line); + $new_linenr++; + } + + $old_linenr++; + } + + return @lines; +} + +sub fix_insert_line { + my ($linenr, $line) = @_; + + my $inserted = { + LINENR => $linenr, + LINE => $line, + }; + push(@fixed_inserted, $inserted); +} + +sub fix_delete_line { + my ($linenr, $line) = @_; + + my $deleted = { + LINENR => $linenr, + LINE => $line, + }; + + push(@fixed_deleted, $deleted); +} + sub ERROR { - if (report("ERROR", $_[0], $_[1])) { + my ($type, $msg) = @_; + + if (report("ERROR", $type, $msg)) { our $clean = 0; our $cnt_error++; return 1; @@ -1522,7 +2034,9 @@ sub ERROR { return 0; } sub WARN { - if (report("WARNING", $_[0], $_[1])) { + my ($type, $msg) = @_; + + if (report("WARNING", $type, $msg)) { our $clean = 0; our $cnt_warn++; return 1; @@ -1530,7 +2044,9 @@ sub WARN { return 0; } sub CHK { - if ($check && report("CHECK", $_[0], $_[1])) { + my ($type, $msg) = @_; + + if ($check && report("CHECK", $type, $msg)) { our $clean = 0; our $cnt_chk++; return 1; @@ -1640,7 +2156,7 @@ sub pos_last_openparen { } } - return $last_openparen + 1; + return length(expand_tabs(substr($line, 0, $last_openparen))) + 1; } sub process { @@ -1660,12 +2176,18 @@ sub process { our $clean = 1; my $signoff = 0; my $is_patch = 0; - - my $in_header_lines = 1; + my $in_header_lines = $file ? 0 : 1; my $in_commit_log = 0; #Scanning lines before patch - + my $has_commit_log = 0; #Encountered lines before patch + my $commit_log_possible_stack_dump = 0; + my $commit_log_long_line = 0; + my $commit_log_has_diff = 0; + my $reported_maintainer_file = 0; my $non_utf8_charset = 0; + my $last_blank_line = 0; + my $last_coalesced_string_linenr = -1; + our @report = (); our $cnt_lines = 0; our $cnt_error = 0; @@ -1677,6 +2199,7 @@ sub process { my $realline = 0; my $realcnt = 0; my $here = ''; + my $context_function; #undef'd unless there's a known function my $in_comment = 0; my $comment_edge = 0; my $first_line = 0; @@ -1710,12 +2233,12 @@ sub process { if ($rawline=~/^\+\+\+\s+(\S+)/) { $setup_docs = 0; - if ($1 =~ m@Documentation/kernel-parameters.txt$@) { + if ($1 =~ m@Documentation/admin-guide/kernel-parameters.rst$@) { $setup_docs = 1; } #next; } - if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) { + if ($rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) { $realline=$1-1; if (defined $2) { $realcnt=$3+1; @@ -1783,15 +2306,19 @@ sub process { $realcnt = 0; $linenr = 0; + $fixlinenr = -1; foreach my $line (@lines) { $linenr++; + $fixlinenr++; my $sline = $line; #copy of $line $sline =~ s/$;/ /g; #with comments as spaces my $rawline = $rawlines[$linenr - 1]; #extract the line range in the file after the patch is applied - if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) { + if (!$in_commit_log && + $line =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) { + my $context = $4; $is_patch = 1; $first_line = $linenr + 1; $realline=$1-1; @@ -1807,6 +2334,11 @@ sub process { %suppress_whiletrailers = (); %suppress_export = (); $suppress_statement = 0; + if ($context =~ /\b(\w+)\s*\(/) { + $context_function = $1; + } else { + undef $context_function; + } next; # track the line number as we move through the hunk, note that @@ -1832,18 +2364,16 @@ sub process { my $hunk_line = ($realcnt != 0); -#make up the handle for any error we report on this line - $prefix = "$filename:$realline: " if ($emacs && $file); - $prefix = "$filename:$linenr: " if ($emacs && !$file); - $here = "#$linenr: " if (!$file); $here = "#$realline: " if ($file); + my $found_file = 0; # extract the filename as it passes if ($line =~ /^diff --git.*?(\S+)$/) { $realfile = $1; $realfile =~ s@^([^/]*)/@@ if (!$file); $in_commit_log = 0; + $found_file = 1; } elsif ($line =~ /^\+\+\+\s+(\S+)/) { $realfile = $1; $realfile =~ s@^([^/]*)/@@ if (!$file); @@ -1860,6 +2390,30 @@ sub process { ERROR("MODIFIED_INCLUDE_ASM", "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n"); } + $found_file = 1; + } + +#make up the handle for any error we report on this line + if ($showfile) { + $prefix = "$realfile:$realline: " + } elsif ($emacs) { + if ($file) { + $prefix = "$filename:$realline: "; + } else { + $prefix = "$filename:$linenr: "; + } + } + + if ($found_file) { + if (is_maintained_obsolete($realfile)) { + WARN("OBSOLETE", + "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy. No unnecessary modifications please.\n"); + } + if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) { + $check = 1; + } else { + $check = $check_orig; + } next; } @@ -1871,6 +2425,17 @@ sub process { $cnt_lines++ if ($realcnt != 0); +# Check if the commit log has what seems like a diff which can confuse patch + if ($in_commit_log && !$commit_log_has_diff && + (($line =~ m@^\s+diff\b.*a/[\w/]+@ && + $line =~ m@^\s+diff\b.*a/([\w/]+)\s+b/$1\b@) || + $line =~ m@^\s*(?:\-\-\-\s+a/|\+\+\+\s+b/)@ || + $line =~ m/^\s*\@\@ \-\d+,\d+ \+\d+,\d+ \@\@/)) { + ERROR("DIFF_IN_COMMIT_MSG", + "Avoid using diff content in the commit message - patch(1) might not work\n" . $herecurr); + $commit_log_has_diff = 1; + } + # Check for incorrect file permissions if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) { my $permhere = $here . "FILE: $realfile\n"; @@ -1887,6 +2452,12 @@ sub process { $in_commit_log = 0; } +# Check if MAINTAINERS is being updated. If so, there's probably no need to +# emit the "does MAINTAINERS need updating?" message on file add/move/delete + if ($line =~ /^\s*MAINTAINERS\s*\|/) { + $reported_maintainer_file = 1; + } + # Check signature styles if (!$in_header_lines && $line =~ /^(\s*)([a-z0-9_-]+by:|$signature_tags)(\s*)(.*)/i) { @@ -1904,7 +2475,7 @@ sub process { if (WARN("BAD_SIGN_OFF", "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] = + $fixed[$fixlinenr] = "$ucfirst_sign_off $email"; } } @@ -1912,7 +2483,7 @@ sub process { if (WARN("BAD_SIGN_OFF", "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] = + $fixed[$fixlinenr] = "$ucfirst_sign_off $email"; } @@ -1921,7 +2492,7 @@ sub process { if (WARN("BAD_SIGN_OFF", "Use a single space after $ucfirst_sign_off\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] = + $fixed[$fixlinenr] = "$ucfirst_sign_off $email"; } } @@ -1957,6 +2528,127 @@ sub process { } } +# Check email subject for common tools that don't need to be mentioned + if ($in_header_lines && + $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) { + WARN("EMAIL_SUBJECT", + "A patch subject line should describe the change not the tool that found it\n" . $herecurr); + } + +# Check for old stable address + if ($line =~ /^\s*cc:\s*.*<?\bstable\@kernel\.org\b>?.*$/i) { + ERROR("STABLE_ADDRESS", + "The 'stable' address should be 'stable\@vger.kernel.org'\n" . $herecurr); + } + +# Check for unwanted Gerrit info + if ($in_commit_log && $line =~ /^\s*change-id:/i) { + ERROR("GERRIT_CHANGE_ID", + "Remove Gerrit Change-Id's before submitting upstream.\n" . $herecurr); + } + +# Check if the commit log is in a possible stack dump + if ($in_commit_log && !$commit_log_possible_stack_dump && + ($line =~ /^\s*(?:WARNING:|BUG:)/ || + $line =~ /^\s*\[\s*\d+\.\d{6,6}\s*\]/ || + # timestamp + $line =~ /^\s*\[\<[0-9a-fA-F]{8,}\>\]/)) { + # stack dump address + $commit_log_possible_stack_dump = 1; + } + +# Check for line lengths > 75 in commit log, warn once + if ($in_commit_log && !$commit_log_long_line && + length($line) > 75 && + !($line =~ /^\s*[a-zA-Z0-9_\/\.]+\s+\|\s+\d+/ || + # file delta changes + $line =~ /^\s*(?:[\w\.\-]+\/)++[\w\.\-]+:/ || + # filename then : + $line =~ /^\s*(?:Fixes:|Link:)/i || + # A Fixes: or Link: line + $commit_log_possible_stack_dump)) { + WARN("COMMIT_LOG_LONG_LINE", + "Possible unwrapped commit description (prefer a maximum 75 chars per line)\n" . $herecurr); + $commit_log_long_line = 1; + } + +# Reset possible stack dump if a blank line is found + if ($in_commit_log && $commit_log_possible_stack_dump && + $line =~ /^\s*$/) { + $commit_log_possible_stack_dump = 0; + } + +# Check for git id commit length and improperly formed commit descriptions + if ($in_commit_log && !$commit_log_possible_stack_dump && + $line !~ /^\s*(?:Link|Patchwork|http|https|BugLink):/i && + $line !~ /^This reverts commit [0-9a-f]{7,40}/ && + ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i || + ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i && + $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i && + $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) { + my $init_char = "c"; + my $orig_commit = ""; + my $short = 1; + my $long = 0; + my $case = 1; + my $space = 1; + my $hasdesc = 0; + my $hasparens = 0; + my $id = '0123456789ab'; + my $orig_desc = "commit description"; + my $description = ""; + + if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) { + $init_char = $1; + $orig_commit = lc($2); + } elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) { + $orig_commit = lc($1); + } + + $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i); + $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i); + $space = 0 if ($line =~ /\bcommit [0-9a-f]/i); + $case = 0 if ($line =~ /\b[Cc]ommit\s+[0-9a-f]{5,40}[^A-F]/); + if ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)"\)/i) { + $orig_desc = $1; + $hasparens = 1; + } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s*$/i && + defined $rawlines[$linenr] && + $rawlines[$linenr] =~ /^\s*\("([^"]+)"\)/) { + $orig_desc = $1; + $hasparens = 1; + } elsif ($line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("[^"]+$/i && + defined $rawlines[$linenr] && + $rawlines[$linenr] =~ /^\s*[^"]+"\)/) { + $line =~ /\bcommit\s+[0-9a-f]{5,}\s+\("([^"]+)$/i; + $orig_desc = $1; + $rawlines[$linenr] =~ /^\s*([^"]+)"\)/; + $orig_desc .= " " . $1; + $hasparens = 1; + } + + ($id, $description) = git_commit_info($orig_commit, + $id, $orig_desc); + + if (defined($id) && + ($short || $long || $space || $case || ($orig_desc ne $description) || !$hasparens)) { + ERROR("GIT_COMMIT_ID", + "Please use git commit description style 'commit <12+ chars of sha1> (\"<title line>\")' - ie: '${init_char}ommit $id (\"$description\")'\n" . $herecurr); + } + } + +# Check for added, moved or deleted files + if (!$reported_maintainer_file && !$in_commit_log && + ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ || + $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ || + ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ && + (defined($1) || defined($2))))) { + $is_patch = 1; + $reported_maintainer_file = 1; + WARN("FILE_PATH_CHANGES", + "added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr); + } + # Check for wrappage within a valid hunk of the file if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) { ERROR("CORRUPTED_PATCH", @@ -1964,20 +2656,6 @@ sub process { $herecurr) if (!$emitted_corrupt++); } -# Check for absolute kernel paths. - if ($tree) { - while ($line =~ m{(?:^|\s)(/\S*)}g) { - my $file = $1; - - if ($file =~ m{^(.*?)(?::\d+)+:?$} && - check_absolute_file($1, $herecurr)) { - # - } else { - check_absolute_file($file, $herecurr); - } - } - } - # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php if (($realfile =~ /^$/ || $line =~ /^\+/) && $rawline !~ m/^$UTF8*$/) { @@ -1994,9 +2672,11 @@ sub process { # Check if it's the start of a commit log # (not a header line and we haven't seen the patch filename) if ($in_header_lines && $realfile =~ /^$/ && - $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) { + !($rawline =~ /^\s+(?:\S|$)/ || + $rawline =~ /^(?:commit\b|from\b|[\w-]+:)/i)) { $in_header_lines = 0; $in_commit_log = 1; + $has_commit_log = 1; } # Check if there is UTF-8 in a commit log when a mail header has explicitly @@ -2013,6 +2693,20 @@ sub process { "8-bit UTF-8 used in possible commit log\n" . $herecurr); } +# Check for absolute kernel paths in commit message + if ($tree && $in_commit_log) { + while ($line =~ m{(?:^|\s)(/\S*)}g) { + my $file = $1; + + if ($file =~ m{^(.*?)(?::\d+)+:?$} && + check_absolute_file($1, $herecurr)) { + # + } else { + check_absolute_file($file, $herecurr); + } + } + } + # Check for various typo / spelling mistakes if (defined($misspellings) && ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) { @@ -2040,14 +2734,14 @@ sub process { if (ERROR("DOS_LINE_ENDINGS", "DOS line endings\n" . $herevet) && $fix) { - $fixed[$linenr - 1] =~ s/[\s\015]+$//; + $fixed[$fixlinenr] =~ s/[\s\015]+$//; } } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) { my $herevet = "$here\n" . cat_vet($rawline) . "\n"; if (ERROR("TRAILING_WHITESPACE", "trailing whitespace\n" . $herevet) && $fix) { - $fixed[$linenr - 1] =~ s/\s+$//; + $fixed[$fixlinenr] =~ s/\s+$//; } $rpt_cleaners = 1; @@ -2055,6 +2749,7 @@ sub process { # Check for FSF mailing addresses. if ($rawline =~ /\bwrite to the Free/i || + $rawline =~ /\b675\s+Mass\s+Ave/i || $rawline =~ /\b59\s+Temple\s+Pl/i || $rawline =~ /\b51\s+Franklin\s+St/i) { my $herevet = "$here\n" . cat_vet($rawline) . "\n"; @@ -2068,7 +2763,7 @@ sub process { # Only applies when adding the entry originally, after that we do not have # sufficient context to determine whether it is indeed long enough. if ($realfile =~ /Kconfig/ && - $line =~ /.\s*config\s+/) { + $line =~ /^\+\s*config\s+/) { my $length = 0; my $cnt = $realcnt; my $ln = $linenr + 1; @@ -2081,10 +2776,11 @@ sub process { $is_end = $lines[$ln - 1] =~ /^\+/; next if ($f =~ /^-/); + last if (!$file && $f =~ /^\@\@/); - if ($lines[$ln - 1] =~ /.\s*(?:bool|tristate)\s*\"/) { + if ($lines[$ln - 1] =~ /^\+\s*(?:bool|tristate)\s*\"/) { $is_start = 1; - } elsif ($lines[$ln - 1] =~ /.\s*(?:---)?help(?:---)?$/) { + } elsif ($lines[$ln - 1] =~ /^\+\s*(?:---)?help(?:---)?$/) { $length = -1; } @@ -2098,16 +2794,29 @@ sub process { } $length++; } - WARN("CONFIG_DESCRIPTION", - "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_start && $is_end && $length < 4); + if ($is_start && $is_end && $length < $min_conf_desc_length) { + WARN("CONFIG_DESCRIPTION", + "please write a paragraph that describes the config symbol fully\n" . $herecurr); + } #print "is_start<$is_start> is_end<$is_end> length<$length>\n"; } -# discourage the addition of CONFIG_EXPERIMENTAL in Kconfig. +# check for MAINTAINERS entries that don't have the right form + if ($realfile =~ /^MAINTAINERS$/ && + $rawline =~ /^\+[A-Z]:/ && + $rawline !~ /^\+[A-Z]:\t\S/) { + if (WARN("MAINTAINERS_STYLE", + "MAINTAINERS entries use one tab after TYPE:\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/^(\+[A-Z]):\s*/$1:\t/; + } + } + +# discourage the use of boolean for type definition attributes of Kconfig options if ($realfile =~ /Kconfig/ && - $line =~ /.\s*depends on\s+.*\bEXPERIMENTAL\b/) { - WARN("CONFIG_EXPERIMENTAL", - "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n"); + $line =~ /^\+\s*\bboolean\b/) { + WARN("CONFIG_TYPE_BOOLEAN", + "Use of boolean is deprecated, please use bool instead.\n" . $herecurr); } if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) && @@ -2125,65 +2834,93 @@ sub process { } # check for DT compatible documentation - if (defined $root && $realfile =~ /\.dts/ && - $rawline =~ /^\+\s*compatible\s*=/) { + if (defined $root && + (($realfile =~ /\.dtsi?$/ && $line =~ /^\+\s*compatible\s*=\s*\"/) || + ($realfile =~ /\.[ch]$/ && $line =~ /^\+.*\.compatible\s*=\s*\"/))) { + my @compats = $rawline =~ /\"([a-zA-Z0-9\-\,\.\+_]+)\"/g; + my $dt_path = $root . "/Documentation/devicetree/bindings/"; + my $vp_file = $dt_path . "vendor-prefixes.txt"; + foreach my $compat (@compats) { my $compat2 = $compat; - my $dt_path = $root . "/Documentation/devicetree/bindings/"; - $compat2 =~ s/\,[a-z]*\-/\,<\.\*>\-/; - `grep -Erq "$compat|$compat2" $dt_path`; + $compat2 =~ s/\,[a-zA-Z0-9]*\-/\,<\.\*>\-/; + my $compat3 = $compat; + $compat3 =~ s/\,([a-z]*)[0-9]*\-/\,$1<\.\*>\-/; + `grep -Erq "$compat|$compat2|$compat3" $dt_path`; if ( $? >> 8 ) { WARN("UNDOCUMENTED_DT_STRING", "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $herecurr); } - my $vendor = $compat; - my $vendor_path = $dt_path . "vendor-prefixes.txt"; - next if (! -f $vendor_path); - $vendor =~ s/^([a-zA-Z0-9]+)\,.*/$1/; - `grep -Eq "$vendor" $vendor_path`; + next if $compat !~ /^([a-zA-Z0-9\-]+)\,/; + my $vendor = $1; + `grep -Eq "^$vendor\\b" $vp_file`; if ( $? >> 8 ) { WARN("UNDOCUMENTED_DT_STRING", - "DT compatible string vendor \"$vendor\" appears un-documented -- check $vendor_path\n" . $herecurr); + "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . $herecurr); } } } # check we are in a valid source file if not then ignore this hunk - next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/); - -#line length limit - if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ && - $rawline !~ /^.\s*\*\s*\@$Ident\s/ && - !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ || - $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) && - $length > $max_line_length) - { - WARN("LONG_LINE", - "line over $max_line_length characters\n" . $herecurr); - } + next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/); -# Check for user-visible strings broken across lines, which breaks the ability -# to grep for the string. Make exceptions when the previous string ends in a -# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{' -# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value - if ($line =~ /^\+\s*"/ && - $prevline =~ /"\s*$/ && - $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) { - WARN("SPLIT_STRING", - "quoted string split across lines\n" . $hereprev); - } +# line length limit (with some exclusions) +# +# There are a few types of lines that may extend beyond $max_line_length: +# logging functions like pr_info that end in a string +# lines with a single string +# #defines that are a single string +# +# There are 3 different line length message types: +# LONG_LINE_COMMENT a comment starts before but extends beyond $max_linelength +# LONG_LINE_STRING a string starts before but extends beyond $max_line_length +# LONG_LINE all other lines longer than $max_line_length +# +# if LONG_LINE is ignored, the other 2 types are also ignored +# -# check for spaces before a quoted newline - if ($rawline =~ /^.*\".*\s\\n/) { - if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE", - "unnecessary whitespace before a quoted newline\n" . $herecurr) && - $fix) { - $fixed[$linenr - 1] =~ s/^(\+.*\".*)\s+\\n/$1\\n/; + if ($line =~ /^\+/ && $length > $max_line_length) { + my $msg_type = "LONG_LINE"; + + # Check the allowed long line types first + + # logging functions that end in a string that starts + # before $max_line_length + if ($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(?:KERN_\S+\s*|[^"]*))?($String\s*(?:|,|\)\s*;)\s*)$/ && + length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) { + $msg_type = ""; + + # lines with only strings (w/ possible termination) + # #defines with only strings + } elsif ($line =~ /^\+\s*$String\s*(?:\s*|,|\)\s*;)\s*$/ || + $line =~ /^\+\s*#\s*define\s+\w+\s+$String$/) { + $msg_type = ""; + + # EFI_GUID is another special case + } elsif ($line =~ /^\+.*\bEFI_GUID\s*\(/) { + $msg_type = ""; + + # Otherwise set the alternate message types + + # a comment starts before $max_line_length + } elsif ($line =~ /($;[\s$;]*)$/ && + length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) { + $msg_type = "LONG_LINE_COMMENT" + + # a quoted string starts before $max_line_length + } elsif ($sline =~ /\s*($String(?:\s*(?:\\|,\s*|\)\s*;\s*))?)$/ && + length(expand_tabs(substr($line, 1, length($line) - length($1) - 1))) <= $max_line_length) { + $msg_type = "LONG_LINE_STRING" } + if ($msg_type ne "" && + (show_type("LONG_LINE") || show_type($msg_type))) { + WARN($msg_type, + "line over $max_line_length characters\n" . $herecurr); + } } # check for adding lines without a newline. @@ -2207,7 +2944,7 @@ sub process { } # check we are in a valid source file C or perl if not then ignore this hunk - next if ($realfile !~ /\.(h|c|pl)$/); + next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/); # at the beginning of a line any tabs must come first and anything # more than 8 must use tabs. @@ -2218,7 +2955,7 @@ sub process { if (ERROR("CODE_INDENT", "code indent should use tabs where possible\n" . $herevet) && $fix) { - $fixed[$linenr - 1] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e; + $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e; } } @@ -2228,9 +2965,9 @@ sub process { if (WARN("SPACE_BEFORE_TAB", "please, no space before tabs\n" . $herevet) && $fix) { - while ($fixed[$linenr - 1] =~ + while ($fixed[$fixlinenr] =~ s/(^\+.*) {8,8}\t/$1\t\t/) {} - while ($fixed[$linenr - 1] =~ + while ($fixed[$fixlinenr] =~ s/(^\+.*) +\t/$1\t/) {} } } @@ -2241,9 +2978,22 @@ sub process { "Logical continuations should be on the previous line\n" . $hereprev); } +# check indentation starts on a tab stop + if ($^V && $^V ge 5.10.0 && + $sline =~ /^\+\t+( +)(?:$c90_Keywords\b|\{\s*$|\}\s*(?:else\b|while\b|\s*$))/) { + my $indent = length($1); + if ($indent % 8) { + if (WARN("TABSTOP", + "Statements should start on a tabstop\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s@(^\+\t+) +@$1 . "\t" x ($indent/8)@e; + } + } + } + # check multi-line statement indentation matches previous line if ($^V && $^V ge 5.10.0 && - $prevline =~ /^\+(\t*)(if \(|$Ident\().*(\&\&|\|\||,)\s*$/) { + $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|(?:\*\s*)*$Lval\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) { $prevline =~ /^\+(\t*)(.*)$/; my $oldindent = $1; my $rest = $2; @@ -2264,45 +3014,154 @@ sub process { if (CHK("PARENTHESIS_ALIGNMENT", "Alignment should match open parenthesis\n" . $hereprev) && $fix && $line =~ /^\+/) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/^\+[ \t]*/\+$goodtabindent/; } } } } - if ($line =~ /^\+.*\*[ \t]*\)[ \t]+(?!$Assignment|$Arithmetic)/) { +# check for space after cast like "(int) foo" or "(struct foo) bar" +# avoid checking a few false positives: +# "sizeof(<type>)" or "__alignof__(<type>)" +# function pointer declarations like "(*foo)(int) = bar;" +# structure definitions like "(struct foo) { 0 };" +# multiline macros that define functions +# known attributes or the __attribute__ keyword + if ($line =~ /^\+(.*)\(\s*$Type\s*\)([ \t]++)((?![={]|\\$|$Attribute|__attribute__))/ && + (!defined($1) || $1 !~ /\b(?:sizeof|__alignof__)\s*$/)) { if (CHK("SPACING", - "No space is necessary after a cast\n" . $hereprev) && + "No space is necessary after a cast\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ - s/^(\+.*\*[ \t]*\))[ \t]+/$1/; + $fixed[$fixlinenr] =~ + s/(\(\s*$Type\s*\))[ \t]+/$1/; } } +# Block comment styles +# Networking with an initial /* if ($realfile =~ m@^(drivers/net/|net/)@ && $prevrawline =~ /^\+[ \t]*\/\*[ \t]*$/ && - $rawline =~ /^\+[ \t]*\*/) { + $rawline =~ /^\+[ \t]*\*/ && + $realline > 2) { WARN("NETWORKING_BLOCK_COMMENT_STYLE", "networking block comments don't use an empty /* line, use /* Comment...\n" . $hereprev); } - if ($realfile =~ m@^(drivers/net/|net/)@ && - $prevrawline =~ /^\+[ \t]*\/\*/ && #starting /* +# Block comments use * on subsequent lines + if ($prevline =~ /$;[ \t]*$/ && #ends in comment + $prevrawline =~ /^\+.*?\/\*/ && #starting /* $prevrawline !~ /\*\/[ \t]*$/ && #no trailing */ $rawline =~ /^\+/ && #line is new $rawline !~ /^\+[ \t]*\*/) { #no leading * - WARN("NETWORKING_BLOCK_COMMENT_STYLE", - "networking block comments start with * on subsequent lines\n" . $hereprev); + WARN("BLOCK_COMMENT_STYLE", + "Block comments use * on subsequent lines\n" . $hereprev); } - if ($realfile =~ m@^(drivers/net/|net/)@ && - $rawline !~ m@^\+[ \t]*\*/[ \t]*$@ && #trailing */ +# Block comments use */ on trailing lines + if ($rawline !~ m@^\+[ \t]*\*/[ \t]*$@ && #trailing */ $rawline !~ m@^\+.*/\*.*\*/[ \t]*$@ && #inline /*...*/ $rawline !~ m@^\+.*\*{2,}/[ \t]*$@ && #trailing **/ $rawline =~ m@^\+[ \t]*.+\*\/[ \t]*$@) { #non blank */ - WARN("NETWORKING_BLOCK_COMMENT_STYLE", - "networking block comments put the trailing */ on a separate line\n" . $herecurr); + WARN("BLOCK_COMMENT_STYLE", + "Block comments use a trailing */ on a separate line\n" . $herecurr); + } + +# Block comment * alignment + if ($prevline =~ /$;[ \t]*$/ && #ends in comment + $line =~ /^\+[ \t]*$;/ && #leading comment + $rawline =~ /^\+[ \t]*\*/ && #leading * + (($prevrawline =~ /^\+.*?\/\*/ && #leading /* + $prevrawline !~ /\*\/[ \t]*$/) || #no trailing */ + $prevrawline =~ /^\+[ \t]*\*/)) { #leading * + my $oldindent; + $prevrawline =~ m@^\+([ \t]*/?)\*@; + if (defined($1)) { + $oldindent = expand_tabs($1); + } else { + $prevrawline =~ m@^\+(.*/?)\*@; + $oldindent = expand_tabs($1); + } + $rawline =~ m@^\+([ \t]*)\*@; + my $newindent = $1; + $newindent = expand_tabs($newindent); + if (length($oldindent) ne length($newindent)) { + WARN("BLOCK_COMMENT_STYLE", + "Block comments should align the * on each line\n" . $hereprev); + } + } + +# check for missing blank lines after struct/union declarations +# with exceptions for various attributes and macros + if ($prevline =~ /^[\+ ]};?\s*$/ && + $line =~ /^\+/ && + !($line =~ /^\+\s*$/ || + $line =~ /^\+\s*EXPORT_SYMBOL/ || + $line =~ /^\+\s*MODULE_/i || + $line =~ /^\+\s*\#\s*(?:end|elif|else)/ || + $line =~ /^\+[a-z_]*init/ || + $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ || + $line =~ /^\+\s*DECLARE/ || + $line =~ /^\+\s*__setup/)) { + if (CHK("LINE_SPACING", + "Please use a blank line after function/struct/union/enum declarations\n" . $hereprev) && + $fix) { + fix_insert_line($fixlinenr, "\+"); + } + } + +# check for multiple consecutive blank lines + if ($prevline =~ /^[\+ ]\s*$/ && + $line =~ /^\+\s*$/ && + $last_blank_line != ($linenr - 1)) { + if (CHK("LINE_SPACING", + "Please don't use multiple blank lines\n" . $hereprev) && + $fix) { + fix_delete_line($fixlinenr, $rawline); + } + + $last_blank_line = $linenr; + } + +# check for missing blank lines after declarations + if ($sline =~ /^\+\s+\S/ && #Not at char 1 + # actual declarations + ($prevline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ || + # function pointer declarations + $prevline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ || + # foo bar; where foo is some local typedef or #define + $prevline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ || + # known declaration macros + $prevline =~ /^\+\s+$declaration_macros/) && + # for "else if" which can look like "$Ident $Ident" + !($prevline =~ /^\+\s+$c90_Keywords\b/ || + # other possible extensions of declaration lines + $prevline =~ /(?:$Compare|$Assignment|$Operators)\s*$/ || + # not starting a section or a macro "\" extended line + $prevline =~ /(?:\{\s*|\\)$/) && + # looks like a declaration + !($sline =~ /^\+\s+$Declare\s*$Ident\s*[=,;:\[]/ || + # function pointer declarations + $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*\)\s*[=,;:\[\(]/ || + # foo bar; where foo is some local typedef or #define + $sline =~ /^\+\s+$Ident(?:\s+|\s*\*\s*)$Ident\s*[=,;\[]/ || + # known declaration macros + $sline =~ /^\+\s+$declaration_macros/ || + # start of struct or union or enum + $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ || + # start or end of block or continuation of declaration + $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ || + # bitfield continuation + $sline =~ /^\+\s+$Ident\s*:\s*\d+\s*[,;]/ || + # other possible extensions of declaration lines + $sline =~ /^\+\s+\(?\s*(?:$Compare|$Assignment|$Operators)/) && + # indentation of previous and current line are the same + (($prevline =~ /\+(\s+)\S/) && $sline =~ /^\+$1\S/)) { + if (WARN("LINE_SPACING", + "Missing a blank line after declarations\n" . $hereprev) && + $fix) { + fix_insert_line($fixlinenr, "\+"); + } } # check for spaces at the beginning of a line. @@ -2315,17 +3174,46 @@ sub process { if (WARN("LEADING_SPACE", "please, no spaces at the start of a line\n" . $herevet) && $fix) { - $fixed[$linenr - 1] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e; + $fixed[$fixlinenr] =~ s/^\+([ \t]+)/"\+" . tabify($1)/e; } } # check we are in a valid C source file if not then ignore this hunk next if ($realfile !~ /\.(h|c)$/); -# discourage the addition of CONFIG_EXPERIMENTAL in #if(def). - if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) { - WARN("CONFIG_EXPERIMENTAL", - "Use of CONFIG_EXPERIMENTAL is deprecated. For alternatives, see https://lkml.org/lkml/2012/10/23/580\n"); +# check if this appears to be the start function declaration, save the name + if ($sline =~ /^\+\{\s*$/ && + $prevline =~ /^\+(?:(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*)?($Ident)\(/) { + $context_function = $1; + } + +# check if this appears to be the end of function declaration + if ($sline =~ /^\+\}\s*$/) { + undef $context_function; + } + +# check indentation of any line with a bare else +# (but not if it is a multiple line "if (foo) return bar; else return baz;") +# if the previous line is a break or return and is indented 1 tab more... + if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) { + my $tabs = length($1) + 1; + if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ || + ($prevline =~ /^\+\t{$tabs,$tabs}return\b/ && + defined $lines[$linenr] && + $lines[$linenr] !~ /^[ \+]\t{$tabs,$tabs}return/)) { + WARN("UNNECESSARY_ELSE", + "else is not generally useful after a break or return\n" . $hereprev); + } + } + +# check indentation of a line with a break; +# if the previous line is a goto or return and is indented the same # of tabs + if ($sline =~ /^\+([\t]+)break\s*;\s*$/) { + my $tabs = $1; + if ($prevline =~ /^\+$tabs(?:goto|return)\b/) { + WARN("UNNECESSARY_BREAK", + "break is not useful after a goto or return\n" . $hereprev); + } } # check for RCS/CVS revision markers @@ -2356,7 +3244,7 @@ sub process { my ($stat, $cond, $line_nr_next, $remain_next, $off_next, $realline_next); #print "LINE<$line>\n"; - if ($linenr >= $suppress_statement && + if ($linenr > $suppress_statement && $realcnt && $sline =~ /.\s*\S/) { ($stat, $cond, $line_nr_next, $remain_next, $off_next) = ctx_statement_block($linenr, $realcnt, 0); @@ -2457,7 +3345,7 @@ sub process { # if/while/etc brace do not go on next line, unless defining a do while loop, # or if that brace on the next line is for something else - if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) { + if ($line =~ /(.*)\b((?:if|while|for|switch|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) { my $pre_ctx = "$1$2"; my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0); @@ -2484,7 +3372,7 @@ sub process { #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n"; #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n"; - if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) { + if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln - 1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) { ERROR("OPEN_BRACE", "that open brace { should be on the previous line\n" . "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n"); @@ -2503,7 +3391,7 @@ sub process { } # Check relative indent for conditionals and blocks. - if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) { + if ($line =~ /\b(?:(?:if|while|for|(?:[a-z_]+|)for_each[a-z_]+)\s*\(|(?:do|else)\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) { ($stat, $cond, $line_nr_next, $remain_next, $off_next) = ctx_statement_block($linenr, $realcnt, 0) if (!defined $stat); @@ -2511,15 +3399,22 @@ sub process { substr($s, 0, length($c), ''); - # Make sure we remove the line prefixes as we have - # none on the first line, and are going to readd them - # where necessary. - $s =~ s/\n./\n/gs; + # remove inline comments + $s =~ s/$;/ /g; + $c =~ s/$;/ /g; # Find out how long the conditional actually is. my @newlines = ($c =~ /\n/gs); my $cond_lines = 1 + $#newlines; + # Make sure we remove the line prefixes as we have + # none on the first line, and are going to readd them + # where necessary. + $s =~ s/\n./\n/gs; + while ($s =~ /\n\s+\\\n/) { + $cond_lines += $s =~ s/\n\s+\\\n/\n/g; + } + # We want to check the first line inside the block # starting at the end of the conditional, so remove: # 1) any blank line termination @@ -2585,8 +3480,12 @@ sub process { #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n"; - if ($check && (($sindent % 8) != 0 || - ($sindent <= $indent && $s ne ''))) { + if ($check && $s ne '' && + (($sindent % 8) != 0 || + ($sindent < $indent) || + ($sindent == $indent && + ($s !~ /^\s*(?:\}|\{|else\b)/)) || + ($sindent > $indent + 8))) { WARN("SUSPECT_CODE_INDENT", "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n"); } @@ -2608,6 +3507,42 @@ sub process { #ignore lines not being added next if ($line =~ /^[^\+]/); +# check for dereferences that span multiple lines + if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ && + $line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) { + $prevline =~ /($Lval\s*(?:\.|->))\s*$/; + my $ref = $1; + $line =~ /^.\s*($Lval)/; + $ref .= $1; + $ref =~ s/\s//g; + WARN("MULTILINE_DEREFERENCE", + "Avoid multiple line dereference - prefer '$ref'\n" . $hereprev); + } + +# check for declarations of signed or unsigned without int + while ($line =~ m{\b($Declare)\s*(?!char\b|short\b|int\b|long\b)\s*($Ident)?\s*[=,;\[\)\(]}g) { + my $type = $1; + my $var = $2; + $var = "" if (!defined $var); + if ($type =~ /^(?:(?:$Storage|$Inline|$Attribute)\s+)*((?:un)?signed)((?:\s*\*)*)\s*$/) { + my $sign = $1; + my $pointer = $2; + + $pointer = "" if (!defined $pointer); + + if (WARN("UNSPECIFIED_INT", + "Prefer '" . trim($sign) . " int" . rtrim($pointer) . "' to bare use of '$sign" . rtrim($pointer) . "'\n" . $herecurr) && + $fix) { + my $decl = trim($sign) . " int "; + my $comp_pointer = $pointer; + $comp_pointer =~ s/\s//g; + $decl .= $comp_pointer; + $decl = rtrim($decl) if ($var eq ""); + $fixed[$fixlinenr] =~ s@\b$sign\s*\Q$pointer\E\s*$var\b@$decl$var@; + } + } + } + # TEST: allow direct testing of the type matcher. if ($dbg_type) { if ($line =~ /^.\s*$Declare\s*$/) { @@ -2634,8 +3569,18 @@ sub process { # check for initialisation to aggregates open brace on the next line if ($line =~ /^.\s*{/ && $prevline =~ /(?:^|[^=])=\s*$/) { - ERROR("OPEN_BRACE", - "that open brace { should be on the previous line\n" . $hereprev); + if (ERROR("OPEN_BRACE", + "that open brace { should be on the previous line\n" . $hereprev) && + $fix && $prevline =~ /^\+/ && $line =~ /^\+/) { + fix_delete_line($fixlinenr - 1, $prevrawline); + fix_delete_line($fixlinenr, $rawline); + my $fixedline = $prevrawline; + $fixedline =~ s/\s*=\s*$/ = {/; + fix_insert_line($fixlinenr, $fixedline); + $fixedline = $line; + $fixedline =~ s/^(.\s*)\{\s*/$1/; + fix_insert_line($fixlinenr, $fixedline); + } } # @@ -2660,10 +3605,10 @@ sub process { if (ERROR("C99_COMMENTS", "do not use C99 // comments\n" . $herecurr) && $fix) { - my $line = $fixed[$linenr - 1]; + my $line = $fixed[$fixlinenr]; if ($line =~ /\/\/(.*)$/) { my $comment = trim($1); - $fixed[$linenr - 1] =~ s@\/\/(.*)$@/\* $comment \*/@; + $fixed[$fixlinenr] =~ s@\/\/(.*)$@/\* $comment \*/@; } } } @@ -2717,24 +3662,30 @@ sub process { } # check for global initialisers. - if ($line =~ /^\+(\s*$Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/) { + if ($line =~ /^\+$Type\s*$Ident(?:\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) { if (ERROR("GLOBAL_INITIALISERS", - "do not initialise globals to 0 or NULL\n" . - $herecurr) && + "do not initialise globals to $1\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/($Type\s*$Ident\s*(?:\s+$Modifier))*\s*=\s*(0|NULL|false)\s*;/$1;/; + $fixed[$fixlinenr] =~ s/(^.$Type\s*$Ident(?:\s+$Modifier)*)\s*=\s*$zero_initializer\s*;/$1;/; } } # check for static initialisers. - if ($line =~ /^\+.*\bstatic\s.*=\s*(0|NULL|false)\s*;/) { + if ($line =~ /^\+.*\bstatic\s.*=\s*($zero_initializer)\s*;/) { if (ERROR("INITIALISED_STATIC", - "do not initialise statics to 0 or NULL\n" . + "do not initialise statics to $1\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/(\bstatic\s.*?)\s*=\s*(0|NULL|false)\s*;/$1;/; + $fixed[$fixlinenr] =~ s/(\bstatic\s.*?)\s*=\s*$zero_initializer\s*;/$1;/; } } +# check for misordered declarations of char/short/int/long with signed/unsigned + while ($sline =~ m{(\b$TypeMisordered\b)}g) { + my $tmp = trim($1); + WARN("MISORDERED_TYPE", + "type '$tmp' should be specified in [[un]signed] [short|int|long|long long] order\n" . $herecurr); + } + # check for static const char * arrays. if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) { WARN("STATIC_CONST_CHAR_ARRAY", @@ -2749,21 +3700,44 @@ sub process { $herecurr); } +# check for const <foo> const where <foo> is not a pointer or array type + if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) { + my $found = $1; + if ($sline =~ /\bconst\s+\Q$found\E\s+const\b\s*\*/) { + WARN("CONST_CONST", + "'const $found const *' should probably be 'const $found * const'\n" . $herecurr); + } elsif ($sline !~ /\bconst\s+\Q$found\E\s+const\s+\w+\s*\[/) { + WARN("CONST_CONST", + "'const $found const' should probably be 'const $found'\n" . $herecurr); + } + } + +# check for non-global char *foo[] = {"bar", ...} declarations. + if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) { + WARN("STATIC_CONST_CHAR_ARRAY", + "char * array declaration might be better as static const\n" . + $herecurr); + } + +# check for sizeof(foo)/sizeof(foo[0]) that could be ARRAY_SIZE(foo) + if ($line =~ m@\bsizeof\s*\(\s*($Lval)\s*\)@) { + my $array = $1; + if ($line =~ m@\b(sizeof\s*\(\s*\Q$array\E\s*\)\s*/\s*sizeof\s*\(\s*\Q$array\E\s*\[\s*0\s*\]\s*\))@) { + my $array_div = $1; + if (WARN("ARRAY_SIZE", + "Prefer ARRAY_SIZE($array)\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\Q$array_div\E/ARRAY_SIZE($array)/; + } + } + } + # check for function declarations without arguments like "int foo()" if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) { if (ERROR("FUNCTION_WITHOUT_ARGS", "Bad function definition - $1() should probably be $1(void)\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/; - } - } - -# check for uses of DEFINE_PCI_DEVICE_TABLE - if ($line =~ /\bDEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=/) { - if (WARN("DEFINE_PCI_DEVICE_TABLE", - "Prefer struct pci_device_id over deprecated DEFINE_PCI_DEVICE_TABLE\n" . $herecurr) && - $fix) { - $fixed[$linenr - 1] =~ s/\b(?:static\s+|)DEFINE_PCI_DEVICE_TABLE\s*\(\s*(\w+)\s*\)\s*=\s*/static const struct pci_device_id $1\[\] = /; + $fixed[$fixlinenr] =~ s/(\b($Type)\s+($Ident))\s*\(\s*\)/$2 $3(void)/; } } @@ -2773,7 +3747,7 @@ sub process { $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ && $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ && $line !~ /\b$typeTypedefs\b/ && - $line !~ /\b__bitwise(?:__|)\b/) { + $line !~ /\b__bitwise\b/) { WARN("NEW_TYPEDEFS", "do not add new typedefs\n" . $herecurr); } @@ -2800,7 +3774,7 @@ sub process { my $sub_from = $ident; my $sub_to = $ident; $sub_to =~ s/\Q$from\E/$to/; - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s@\Q$sub_from\E@$sub_to@; } } @@ -2828,19 +3802,21 @@ sub process { my $sub_from = $match; my $sub_to = $match; $sub_to =~ s/\Q$from\E/$to/; - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s@\Q$sub_from\E@$sub_to@; } } } -# # no BUG() or BUG_ON() -# if ($line =~ /\b(BUG|BUG_ON)\b/) { -# print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n"; -# print "$herecurr"; -# $clean = 0; -# } +# avoid BUG() or BUG_ON() + if ($line =~ /\b(?:BUG|BUG_ON)\b/) { + my $msg_type = \&WARN; + $msg_type = \&CHK if ($file); + &{$msg_type}("AVOID_BUG", + "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()\n" . $herecurr); + } +# avoid LINUX_VERSION_CODE if ($line =~ /\bLINUX_VERSION_CODE\b/) { WARN("LINUX_VERSION_CODE", "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr); @@ -2849,7 +3825,7 @@ sub process { # check for uses of printk_ratelimit if ($line =~ /\bprintk_ratelimit\s*\(/) { WARN("PRINTK_RATELIMITED", -"Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr); + "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr); } # printk should use KERN_* levels. Note that follow on printk's on the @@ -2883,14 +3859,14 @@ sub process { my $level2 = $level; $level2 = "dbg" if ($level eq "debug"); WARN("PREFER_PR_LEVEL", - "Prefer netdev_$level2(netdev, ... then dev_$level2(dev, ... then pr_$level(... to printk(KERN_$orig ...\n" . $herecurr); + "Prefer [subsystem eg: netdev]_$level2([subsystem]dev, ... then dev_$level2(dev, ... then pr_$level(... to printk(KERN_$orig ...\n" . $herecurr); } if ($line =~ /\bpr_warning\s*\(/) { if (WARN("PREFER_PR_LEVEL", "Prefer pr_warn(... to pr_warning(...\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\bpr_warning\b/pr_warn/; } } @@ -2904,19 +3880,50 @@ sub process { "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr); } +# ENOSYS means "bad syscall nr" and nothing else. This will have a small +# number of false positives, but assembly files are not checked, so at +# least the arch entry code will not trigger this warning. + if ($line =~ /\bENOSYS\b/) { + WARN("ENOSYS", + "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr); + } + # function brace can't be on same line, except for #defines of do while, # or if closed on same line - if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and + if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) { - ERROR("OPEN_BRACE", - "open brace '{' following function declarations go on the next line\n" . $herecurr); + if (ERROR("OPEN_BRACE", + "open brace '{' following function declarations go on the next line\n" . $herecurr) && + $fix) { + fix_delete_line($fixlinenr, $rawline); + my $fixed_line = $rawline; + $fixed_line =~ /(^..*$Type\s*$Ident\(.*\)\s*){(.*)$/; + my $line1 = $1; + my $line2 = $2; + fix_insert_line($fixlinenr, ltrim($line1)); + fix_insert_line($fixlinenr, "\+{"); + if ($line2 !~ /^\s*$/) { + fix_insert_line($fixlinenr, "\+\t" . trim($line2)); + } + } } # open braces for enum, union and struct go on the same line. if ($line =~ /^.\s*{/ && $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) { - ERROR("OPEN_BRACE", - "open brace '{' following $1 go on the same line\n" . $hereprev); + if (ERROR("OPEN_BRACE", + "open brace '{' following $1 go on the same line\n" . $hereprev) && + $fix && $prevline =~ /^\+/ && $line =~ /^\+/) { + fix_delete_line($fixlinenr - 1, $prevrawline); + fix_delete_line($fixlinenr, $rawline); + my $fixedline = rtrim($prevrawline) . " {"; + fix_insert_line($fixlinenr, $fixedline); + $fixedline = $rawline; + $fixedline =~ s/^(.\s*)\{\s*/$1\t/; + if ($fixedline !~ /^\+\s*$/) { + fix_insert_line($fixlinenr, $fixedline); + } + } } # missing space after union, struct or enum definition @@ -2924,7 +3931,7 @@ sub process { if (WARN("SPACING", "missing space after $1 definition\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/^(.\s*(?:typedef\s+)?(?:enum|union|struct)(?:\s+$Ident){1,2})([=\{])/$1 $2/; } } @@ -2932,10 +3939,7 @@ sub process { # Function pointer declarations # check spacing between type, funcptr, and args # canonical declaration is "type (*funcptr)(args...)" -# -# the $Declare variable will capture all spaces after the type -# so check it for trailing missing spaces or multiple spaces - if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)$Ident(\s*)\)(\s*)\(/) { + if ($line =~ /^.\s*($Declare)\((\s*)\*(\s*)($Ident)(\s*)\)(\s*)\(/) { my $declare = $1; my $pre_pointer_space = $2; my $post_pointer_space = $3; @@ -2943,16 +3947,30 @@ sub process { my $post_funcname_space = $5; my $pre_args_space = $6; - if ($declare !~ /\s$/) { +# the $Declare variable will capture all spaces after the type +# so check it for a missing trailing missing space but pointer return types +# don't need a space so don't warn for those. + my $post_declare_space = ""; + if ($declare =~ /(\s+)$/) { + $post_declare_space = $1; + $declare = rtrim($declare); + } + if ($declare !~ /\*$/ && $post_declare_space =~ /^$/) { WARN("SPACING", "missing space after return type\n" . $herecurr); + $post_declare_space = " "; } # unnecessary space "type (*funcptr)(args...)" - elsif ($declare =~ /\s{2,}$/) { - WARN("SPACING", - "Multiple spaces after return type\n" . $herecurr); - } +# This test is not currently implemented because these declarations are +# equivalent to +# int foo(int bar, ...) +# and this is form shouldn't/doesn't generate a checkpatch warning. +# +# elsif ($declare =~ /\s{2,}$/) { +# WARN("SPACING", +# "Multiple spaces after return type\n" . $herecurr); +# } # unnecessary space "type ( *funcptr)(args...)" if (defined $pre_pointer_space && @@ -2983,8 +4001,8 @@ sub process { } if (show_type("SPACING") && $fix) { - $fixed[$linenr - 1] =~ - s/^(.\s*$Declare)\(\s*\*\s*($Ident)\s*\)\s*\(/rtrim($1) . " " . "\(\*$2\)\("/ex; + $fixed[$fixlinenr] =~ + s/^(.\s*)$Declare\s*\(\s*\*\s*$Ident\s*\)\s*\(/$1 . $declare . $post_declare_space . '(*' . $funcname . ')('/ex; } } @@ -3000,7 +4018,7 @@ sub process { if (ERROR("BRACKET_SPACE", "space prohibited before open square bracket '['\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/^(\+.*?)\s+\[/$1\[/; } } @@ -3035,7 +4053,7 @@ sub process { if (WARN("SPACING", "space prohibited between function name and open parenthesis '('\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\b$name\s+\(/$name\(/; } } @@ -3126,7 +4144,7 @@ sub process { # Ignore operators passed as parameters. if ($op_type ne 'V' && - $ca =~ /\s$/ && $cc =~ /^\s*,/) { + $ca =~ /\s$/ && $cc =~ /^\s*[,\)]/) { # # Ignore comments # } elsif ($op =~ /^$;+$/) { @@ -3145,10 +4163,13 @@ sub process { # // is a comment } elsif ($op eq '//') { + # : when part of a bitfield + } elsif ($opv eq ':B') { + # skip the bitfield test for now + # No spaces for: # -> - # : when part of a bitfield - } elsif ($op eq '->' || $opv eq ':B') { + } elsif ($op eq '->') { if ($ctx =~ /Wx.|.xW/) { if (ERROR("SPACING", "spaces prohibited around that '$op' $at\n" . $hereptr)) { @@ -3160,14 +4181,33 @@ sub process { } } - # , must have a space on the right. + # , must not have a space before and must have a space on the right. } elsif ($op eq ',') { + my $rtrim_before = 0; + my $space_after = 0; + if ($ctx =~ /Wx./) { + if (ERROR("SPACING", + "space prohibited before that '$op' $at\n" . $hereptr)) { + $line_fixed = 1; + $rtrim_before = 1; + } + } if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) { if (ERROR("SPACING", "space required after that '$op' $at\n" . $hereptr)) { - $good = $fix_elements[$n] . trim($fix_elements[$n + 1]) . " "; $line_fixed = 1; $last_after = $n; + $space_after = 1; + } + } + if ($rtrim_before || $space_after) { + if ($rtrim_before) { + $good = rtrim($fix_elements[$n]) . trim($fix_elements[$n + 1]); + } else { + $good = $fix_elements[$n] . trim($fix_elements[$n + 1]); + } + if ($space_after) { + $good .= " "; } } @@ -3239,7 +4279,22 @@ sub process { $op eq '*' or $op eq '/' or $op eq '%') { - if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) { + if ($check) { + if (defined $fix_elements[$n + 2] && $ctx !~ /[EW]x[EW]/) { + if (CHK("SPACING", + "spaces preferred around that '$op' $at\n" . $hereptr)) { + $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " "; + $fix_elements[$n + 2] =~ s/^\s+//; + $line_fixed = 1; + } + } elsif (!defined $fix_elements[$n + 2] && $ctx !~ /Wx[OE]/) { + if (CHK("SPACING", + "space preferred before that '$op' $at\n" . $hereptr)) { + $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]); + $line_fixed = 1; + } + } + } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) { if (ERROR("SPACING", "need consistent spacing around '$op' $at\n" . $hereptr)) { $good = rtrim($fix_elements[$n]) . " " . trim($fix_elements[$n + 1]) . " "; @@ -3274,6 +4329,14 @@ sub process { $ok = 1; } + # for asm volatile statements + # ignore a colon with another + # colon immediately before or after + if (($op eq ':') && + ($ca =~ /:$/ || $cc =~ /^:/)) { + $ok = 1; + } + # messages are ERROR, but ?: are CHK if ($ok == 0) { my $msg_type = \&ERROR; @@ -3300,8 +4363,8 @@ sub process { $fixed_line = $fixed_line . $fix_elements[$#elements]; } - if ($fix && $line_fixed && $fixed_line ne $fixed[$linenr - 1]) { - $fixed[$linenr - 1] = $fixed_line; + if ($fix && $line_fixed && $fixed_line ne $fixed[$fixlinenr]) { + $fixed[$fixlinenr] = $fixed_line; } @@ -3312,7 +4375,7 @@ sub process { if (WARN("SPACING", "space prohibited before semicolon\n" . $herecurr) && $fix) { - 1 while $fixed[$linenr - 1] =~ + 1 while $fixed[$fixlinenr] =~ s/^(\+.*\S)\s+;/$1;/; } } @@ -3340,12 +4403,12 @@ sub process { ## } #need space before brace following if, while, etc - if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\){/) || + if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\)\{/) || $line =~ /do\{/) { if (ERROR("SPACING", "space required before the open brace '{'\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/^(\+.*(?:do|\))){/$1 {/; + $fixed[$fixlinenr] =~ s/^(\+.*(?:do|\)))\{/$1 {/; } } @@ -3363,7 +4426,7 @@ sub process { if (ERROR("SPACING", "space required after that close brace '}'\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/}((?!(?:,|;|\)))\S)/} $1/; } } @@ -3373,7 +4436,7 @@ sub process { if (ERROR("SPACING", "space prohibited after that open square bracket '['\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\[\s+/\[/; } } @@ -3381,7 +4444,7 @@ sub process { if (ERROR("SPACING", "space prohibited before that close square bracket ']'\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\s+\]/\]/; } } @@ -3392,7 +4455,7 @@ sub process { if (ERROR("SPACING", "space prohibited after that open parenthesis '('\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\(\s+/\(/; } } @@ -3402,36 +4465,77 @@ sub process { if (ERROR("SPACING", "space prohibited before that close parenthesis ')'\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\s+\)/\)/; } } +# check unnecessary parentheses around addressof/dereference single $Lvals +# ie: &(foo->bar) should be &foo->bar and *(foo->bar) should be *foo->bar + + while ($line =~ /(?:[^&]&\s*|\*)\(\s*($Ident\s*(?:$Member\s*)+)\s*\)/g) { + my $var = $1; + if (CHK("UNNECESSARY_PARENTHESES", + "Unnecessary parentheses around $var\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\(\s*\Q$var\E\s*\)/$var/; + } + } + +# check for unnecessary parentheses around function pointer uses +# ie: (foo->bar)(); should be foo->bar(); +# but not "if (foo->bar) (" to avoid some false positives + if ($line =~ /(\bif\s*|)(\(\s*$Ident\s*(?:$Member\s*)+\))[ \t]*\(/ && $1 !~ /^if/) { + my $var = $2; + if (CHK("UNNECESSARY_PARENTHESES", + "Unnecessary parentheses around function pointer $var\n" . $herecurr) && + $fix) { + my $var2 = deparenthesize($var); + $var2 =~ s/\s//g; + $fixed[$fixlinenr] =~ s/\Q$var\E/$var2/; + } + } + #goto labels aren't indented, allow a single space however if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) { if (WARN("INDENTED_LABEL", "labels should not be indented\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/^(.)\s+/$1/; } } -# Return is not a function. +# return is not a function if (defined($stat) && $stat =~ /^.\s*return(\s*)\(/s) { my $spacing = $1; if ($^V && $^V ge 5.10.0 && - $stat =~ /^.\s*return\s*$balanced_parens\s*;\s*$/) { - ERROR("RETURN_PARENTHESES", - "return is not a function, parentheses are not required\n" . $herecurr); - + $stat =~ /^.\s*return\s*($balanced_parens)\s*;\s*$/) { + my $value = $1; + $value = deparenthesize($value); + if ($value =~ m/^\s*$FuncArg\s*(?:\?|$)/) { + ERROR("RETURN_PARENTHESES", + "return is not a function, parentheses are not required\n" . $herecurr); + } } elsif ($spacing !~ /\s+/) { ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr); } } +# unnecessary return in a void function +# at end-of-function, with the previous line a single leading tab, then return; +# and the line before that not a goto label target like "out:" + if ($sline =~ /^[ \+]}\s*$/ && + $prevline =~ /^\+\treturn\s*;\s*$/ && + $linenr >= 3 && + $lines[$linenr - 3] =~ /^[ +]/ && + $lines[$linenr - 3] !~ /^[ +]\s*$Ident\s*:/) { + WARN("RETURN_VOID", + "void function return statements are not generally useful\n" . $hereprev); + } + # if statements using unnecessary parentheses - ie: if ((foo == bar)) if ($^V && $^V ge 5.10.0 && $line =~ /\bif\s*((?:\(\s*){2,})/) { @@ -3446,12 +4550,41 @@ sub process { } } -# Return of what appears to be an errno should normally be -'ve - if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) { +# comparisons with a constant or upper case identifier on the left +# avoid cases like "foo + BAR < baz" +# only fix matches surrounded by parentheses to avoid incorrect +# conversions like "FOO < baz() + 5" being "misfixed" to "baz() > FOO + 5" + if ($^V && $^V ge 5.10.0 && + $line =~ /^\+(.*)\b($Constant|[A-Z_][A-Z0-9_]*)\s*($Compare)\s*($LvalOrFunc)/) { + my $lead = $1; + my $const = $2; + my $comp = $3; + my $to = $4; + my $newcomp = $comp; + if ($lead !~ /(?:$Operators|\.)\s*$/ && + $to !~ /^(?:Constant|[A-Z_][A-Z0-9_]*)$/ && + WARN("CONSTANT_COMPARISON", + "Comparisons should place the constant on the right side of the test\n" . $herecurr) && + $fix) { + if ($comp eq "<") { + $newcomp = ">"; + } elsif ($comp eq "<=") { + $newcomp = ">="; + } elsif ($comp eq ">") { + $newcomp = "<"; + } elsif ($comp eq ">=") { + $newcomp = "<="; + } + $fixed[$fixlinenr] =~ s/\(\s*\Q$const\E\s*$Compare\s*\Q$to\E\s*\)/($to $newcomp $const)/; + } + } + +# Return of what appears to be an errno should normally be negative + if ($sline =~ /\breturn(?:\s*\(+\s*|\s+)(E[A-Z]+)(?:\s*\)+\s*|\s*)[;:,]/) { my $name = $1; if ($name ne 'EOF' && $name ne 'ERROR') { WARN("USE_NEGATIVE_ERRNO", - "return of an errno should typically be -ve (return -$1)\n" . $herecurr); + "return of an errno should typically be negative (ie: return -$1)\n" . $herecurr); } } @@ -3460,7 +4593,7 @@ sub process { if (ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\b(if|while|for|switch)\(/$1 \(/; } } @@ -3550,7 +4683,7 @@ sub process { # if should not continue a brace if ($line =~ /}\s*if\b/) { ERROR("TRAILING_STATEMENTS", - "trailing statements should be on next line\n" . + "trailing statements should be on next line (or did you mean 'else if'?)\n" . $herecurr); } # case and default should not have general statements after them @@ -3566,14 +4699,26 @@ sub process { # Check for }<nl>else {, these must be at the same # indent level to be relevant to each other. - if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and - $previndent == $indent) { - ERROR("ELSE_AFTER_BRACE", - "else should follow close brace '}'\n" . $hereprev); + if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ && + $previndent == $indent) { + if (ERROR("ELSE_AFTER_BRACE", + "else should follow close brace '}'\n" . $hereprev) && + $fix && $prevline =~ /^\+/ && $line =~ /^\+/) { + fix_delete_line($fixlinenr - 1, $prevrawline); + fix_delete_line($fixlinenr, $rawline); + my $fixedline = $prevrawline; + $fixedline =~ s/}\s*$//; + if ($fixedline !~ /^\+\s*$/) { + fix_insert_line($fixlinenr, $fixedline); + } + $fixedline = $rawline; + $fixedline =~ s/^(.\s*)else/$1} else/; + fix_insert_line($fixlinenr, $fixedline); + } } - if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and - $previndent == $indent) { + if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ && + $previndent == $indent) { my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0); # Find out what is on the end of the line after the @@ -3582,8 +4727,18 @@ sub process { $s =~ s/\n.*//g; if ($s =~ /^\s*;/) { - ERROR("WHILE_AFTER_BRACE", - "while should follow close brace '}'\n" . $hereprev); + if (ERROR("WHILE_AFTER_BRACE", + "while should follow close brace '}'\n" . $hereprev) && + $fix && $prevline =~ /^\+/ && $line =~ /^\+/) { + fix_delete_line($fixlinenr - 1, $prevrawline); + fix_delete_line($fixlinenr, $rawline); + my $fixedline = $prevrawline; + my $trailing = $rawline; + $trailing =~ s/^\+//; + $trailing = trim($trailing); + $fixedline =~ s/}\s*$/} $trailing/; + fix_insert_line($fixlinenr, $fixedline); + } } } @@ -3597,7 +4752,7 @@ sub process { "Avoid gcc v4.3+ binary constant extension: <$var>\n" . $herecurr) && $fix) { my $hexval = sprintf("0x%x", oct($var)); - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/\b$var\b/$hexval/; } } @@ -3608,7 +4763,9 @@ sub process { #Ignore Page<foo> variants $var !~ /^(?:Clear|Set|TestClear|TestSet|)Page[A-Z]/ && #Ignore SI style variants like nS, mV and dB (ie: max_uV, regulator_min_uA_show) - $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/) { + $var !~ /^(?:[a-z_]*?)_?[a-z][A-Z](?:_[a-z_]+)?$/ && +#Ignore some three character SI units explicitly, like MiB and KHz + $var !~ /^(?:[a-z_]*?)_?(?:[KMGT]iB|[KMGT]?Hz)(?:_[a-z_]+)?$/) { while ($var =~ m{($Ident)}g) { my $word = $1; next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/); @@ -3633,11 +4790,12 @@ sub process { if (WARN("WHITESPACE_AFTER_LINE_CONTINUATION", "Whitespace after \\ makes next lines useless\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\s+$//; + $fixed[$fixlinenr] =~ s/\s+$//; } } -#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line) +# warn if <asm/foo.h> is #included and <linux/foo.h> is available and includes +# itself <asm/foo.h> (uses RAW line) if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) { my $file = "$1.h"; my $checkfile = "include/linux/$file"; @@ -3645,12 +4803,15 @@ sub process { $realfile ne $checkfile && $1 !~ /$allowed_asm_includes/) { - if ($realfile =~ m{^arch/}) { - CHK("ARCH_INCLUDE_LINUX", - "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr); - } else { - WARN("INCLUDE_LINUX", - "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr); + my $asminclude = `grep -Ec "#include\\s+<asm/$file>" $root/$checkfile`; + if ($asminclude > 0) { + if ($realfile =~ m{^arch/}) { + CHK("ARCH_INCLUDE_LINUX", + "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr); + } else { + WARN("INCLUDE_LINUX", + "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr); + } } } } @@ -3664,13 +4825,28 @@ sub process { my $cnt = $realcnt; my ($off, $dstat, $dcond, $rest); my $ctx = ''; + my $has_flow_statement = 0; + my $has_arg_concat = 0; ($dstat, $dcond, $ln, $cnt, $off) = ctx_statement_block($linenr, $realcnt, 0); $ctx = $dstat; #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n"; #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n"; - $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//; + $has_flow_statement = 1 if ($ctx =~ /\b(goto|return)\b/); + $has_arg_concat = 1 if ($ctx =~ /\#\#/ && $ctx !~ /\#\#\s*(?:__VA_ARGS__|args)\b/); + + $dstat =~ s/^.\s*\#\s*define\s+$Ident(\([^\)]*\))?\s*//; + my $define_args = $1; + my $define_stmt = $dstat; + my @def_args = (); + + if (defined $define_args && $define_args ne "") { + $define_args = substr($define_args, 1, length($define_args) - 2); + $define_args =~ s/\s*//g; + @def_args = split(",", $define_args); + } + $dstat =~ s/$;//g; $dstat =~ s/\\\n.//g; $dstat =~ s/^\s*//s; @@ -3679,16 +4855,19 @@ sub process { # Flatten any parentheses and braces while ($dstat =~ s/\([^\(\)]*\)/1/ || $dstat =~ s/\{[^\{\}]*\}/1/ || - $dstat =~ s/\[[^\[\]]*\]/1/) + $dstat =~ s/.\[[^\[\]]*\]/1/) { } # Flatten any obvious string concatentation. - while ($dstat =~ s/("X*")\s*$Ident/$1/ || - $dstat =~ s/$Ident\s*("X*")/$1/) + while ($dstat =~ s/($String)\s*$Ident/$1/ || + $dstat =~ s/$Ident\s*($String)/$1/) { } + # Make asm volatile uses seem like a generic function + $dstat =~ s/\b_*asm_*\s+_*volatile_*\b/asm_volatile/g; + my $exceptions = qr{ $Declare| module_param_named| @@ -3699,14 +4878,24 @@ sub process { union| struct| \.$Ident\s*=\s*| - ^\"|\"$ + ^\"|\"$| + ^\[ }x; #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n"; + + $ctx =~ s/\n*$//; + my $herectx = $here . "\n"; + my $stmt_cnt = statement_rawlines($ctx); + + for (my $n = 0; $n < $stmt_cnt; $n++) { + $herectx .= raw_line($linenr, $n) . "\n"; + } + if ($dstat ne '' && $dstat !~ /^(?:$Ident|-?$Constant),$/ && # 10, // foo(), $dstat !~ /^(?:$Ident|-?$Constant);$/ && # foo(); $dstat !~ /^[!~-]?(?:$Lval|$Constant)$/ && # 10 // foo() // !foo // ~foo // -foo // foo->bar // foo.bar->baz - $dstat !~ /^'X'$/ && # character constants + $dstat !~ /^'X'$/ && $dstat !~ /^'XX'$/ && # character constants $dstat !~ /$exceptions/ && $dstat !~ /^\.$Ident\s*=/ && # .foo = $dstat !~ /^(?:\#\s*$Ident|\#\s*$Constant)\s*$/ && # stringification #foo @@ -3717,21 +4906,69 @@ sub process { $dstat !~ /^\(\{/ && # ({... $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/) { - $ctx =~ s/\n*$//; + if ($dstat =~ /^\s*if\b/) { + ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE", + "Macros starting with if should be enclosed by a do - while loop to avoid possible if/else logic defects\n" . "$herectx"); + } elsif ($dstat =~ /;/) { + ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE", + "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx"); + } else { + ERROR("COMPLEX_MACRO", + "Macros with complex values should be enclosed in parentheses\n" . "$herectx"); + } + + } + + # Make $define_stmt single line, comment-free, etc + my @stmt_array = split('\n', $define_stmt); + my $first = 1; + $define_stmt = ""; + foreach my $l (@stmt_array) { + $l =~ s/\\$//; + if ($first) { + $define_stmt = $l; + $first = 0; + } elsif ($l =~ /^[\+ ]/) { + $define_stmt .= substr($l, 1); + } + } + $define_stmt =~ s/$;//g; + $define_stmt =~ s/\s+/ /g; + $define_stmt = trim($define_stmt); + +# check if any macro arguments are reused (ignore '...' and 'type') + foreach my $arg (@def_args) { + next if ($arg =~ /\.\.\./); + next if ($arg =~ /^type$/i); + my $tmp_stmt = $define_stmt; + $tmp_stmt =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g; + $tmp_stmt =~ s/\#+\s*$arg\b//g; + $tmp_stmt =~ s/\b$arg\s*\#\#//g; + my $use_cnt = $tmp_stmt =~ s/\b$arg\b//g; + if ($use_cnt > 1) { + CHK("MACRO_ARG_REUSE", + "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx"); + } +# check if any macro arguments may have other precedence issues + if ($tmp_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m && + ((defined($1) && $1 ne ',') || + (defined($2) && $2 ne ','))) { + CHK("MACRO_ARG_PRECEDENCE", + "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx"); + } + } + +# check for macros with flow control, but without ## concatenation +# ## concatenation is commonly a macro that defines a function so ignore those + if ($has_flow_statement && !$has_arg_concat) { my $herectx = $here . "\n"; my $cnt = statement_rawlines($ctx); for (my $n = 0; $n < $cnt; $n++) { $herectx .= raw_line($linenr, $n) . "\n"; } - - if ($dstat =~ /;/) { - ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE", - "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx"); - } else { - ERROR("COMPLEX_MACRO", - "Macros with complex values should be enclosed in parenthesis\n" . "$herectx"); - } + WARN("MACRO_WITH_FLOW_CONTROL", + "Macros with flow control statements should be avoided\n" . "$herectx"); } # check for line continuations outside of #defines, preprocessor #, and asm @@ -3761,6 +4998,7 @@ sub process { $ctx = $dstat; $dstat =~ s/\\\n.//g; + $dstat =~ s/$;/ /g; if ($dstat =~ /^\+\s*#\s*define\s+$Ident\s*${balanced_parens}\s*do\s*{(.*)\s*}\s*while\s*\(\s*0\s*\)\s*([;\s]*)\s*$/) { my $stmts = $2; @@ -3783,6 +5021,17 @@ sub process { WARN("DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON", "do {} while (0) macros should not be semicolon terminated\n" . "$herectx"); } + } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident.*;\s*$/) { + $ctx =~ s/\n*$//; + my $cnt = statement_rawlines($ctx); + my $herectx = $here . "\n"; + + for (my $n = 0; $n < $cnt; $n++) { + $herectx .= raw_line($linenr, $n) . "\n"; + } + + WARN("TRAILING_SEMICOLON", + "macros should not use a trailing semicolon\n" . "$herectx"); } } @@ -3914,21 +5163,137 @@ sub process { } } +# check for single line unbalanced braces + if ($sline =~ /^.\s*\}\s*else\s*$/ || + $sline =~ /^.\s*else\s*\{\s*$/) { + CHK("BRACES", "Unbalanced braces around else statement\n" . $herecurr); + } + # check for unnecessary blank lines around braces if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) { - CHK("BRACES", - "Blank lines aren't necessary before a close brace '}'\n" . $hereprev); + if (CHK("BRACES", + "Blank lines aren't necessary before a close brace '}'\n" . $hereprev) && + $fix && $prevrawline =~ /^\+/) { + fix_delete_line($fixlinenr - 1, $prevrawline); + } } if (($rawline =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) { - CHK("BRACES", - "Blank lines aren't necessary after an open brace '{'\n" . $hereprev); + if (CHK("BRACES", + "Blank lines aren't necessary after an open brace '{'\n" . $hereprev) && + $fix) { + fix_delete_line($fixlinenr, $rawline); + } } # no volatiles please my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b}; if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) { WARN("VOLATILE", - "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr); + "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr); + } + +# Check for user-visible strings broken across lines, which breaks the ability +# to grep for the string. Make exceptions when the previous string ends in a +# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{' +# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value + if ($line =~ /^\+\s*$String/ && + $prevline =~ /"\s*$/ && + $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) { + if (WARN("SPLIT_STRING", + "quoted string split across lines\n" . $hereprev) && + $fix && + $prevrawline =~ /^\+.*"\s*$/ && + $last_coalesced_string_linenr != $linenr - 1) { + my $extracted_string = get_quoted_string($line, $rawline); + my $comma_close = ""; + if ($rawline =~ /\Q$extracted_string\E(\s*\)\s*;\s*$|\s*,\s*)/) { + $comma_close = $1; + } + + fix_delete_line($fixlinenr - 1, $prevrawline); + fix_delete_line($fixlinenr, $rawline); + my $fixedline = $prevrawline; + $fixedline =~ s/"\s*$//; + $fixedline .= substr($extracted_string, 1) . trim($comma_close); + fix_insert_line($fixlinenr - 1, $fixedline); + $fixedline = $rawline; + $fixedline =~ s/\Q$extracted_string\E\Q$comma_close\E//; + if ($fixedline !~ /\+\s*$/) { + fix_insert_line($fixlinenr, $fixedline); + } + $last_coalesced_string_linenr = $linenr; + } + } + +# check for missing a space in a string concatenation + if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) { + WARN('MISSING_SPACE', + "break quoted strings at a space character\n" . $hereprev); + } + +# check for an embedded function name in a string when the function is known +# This does not work very well for -f --file checking as it depends on patch +# context providing the function name or a single line form for in-file +# function declarations + if ($line =~ /^\+.*$String/ && + defined($context_function) && + get_quoted_string($line, $rawline) =~ /\b$context_function\b/ && + length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) { + WARN("EMBEDDED_FUNCTION_NAME", + "Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr); + } + +# check for spaces before a quoted newline + if ($rawline =~ /^.*\".*\s\\n/) { + if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE", + "unnecessary whitespace before a quoted newline\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/^(\+.*\".*)\s+\\n/$1\\n/; + } + + } + +# concatenated string without spaces between elements + if ($line =~ /$String[A-Z_]/ || $line =~ /[A-Za-z0-9_]$String/) { + CHK("CONCATENATED_STRING", + "Concatenated strings should use spaces between elements\n" . $herecurr); + } + +# uncoalesced string fragments + if ($line =~ /$String\s*"/) { + WARN("STRING_FRAGMENTS", + "Consecutive strings are generally better as a single string\n" . $herecurr); + } + +# check for non-standard and hex prefixed decimal printf formats + my $show_L = 1; #don't show the same defect twice + my $show_Z = 1; + while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) { + my $string = substr($rawline, $-[1], $+[1] - $-[1]); + $string =~ s/%%/__/g; + # check for %L + if ($show_L && $string =~ /%[\*\d\.\$]*L([diouxX])/) { + WARN("PRINTF_L", + "\%L$1 is non-standard C, use %ll$1\n" . $herecurr); + $show_L = 0; + } + # check for %Z + if ($show_Z && $string =~ /%[\*\d\.\$]*Z([diouxX])/) { + WARN("PRINTF_Z", + "%Z$1 is non-standard C, use %z$1\n" . $herecurr); + $show_Z = 0; + } + # check for 0x<decimal> + if ($string =~ /0x%[\*\d\.\$\Llzth]*[diou]/) { + ERROR("PRINTF_0XDECIMAL", + "Prefixing 0x with decimal output is defective\n" . $herecurr); + } + } + +# check for line continuations in quoted strings with odd counts of " + if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) { + WARN("LINE_CONTINUATIONS", + "Avoid line continuations in quoted strings\n" . $herecurr); } # warn about #if 0 @@ -3940,10 +5305,90 @@ sub process { # check for needless "if (<foo>) fn(<foo>)" uses if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) { - my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;'; - if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) { - WARN('NEEDLESS_IF', - "$1(NULL) is safe this check is probably not required\n" . $hereprev); + my $tested = quotemeta($1); + my $expr = '\s*\(\s*' . $tested . '\s*\)\s*;'; + if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?|(?:kmem_cache|mempool|dma_pool)_destroy)$expr/) { + my $func = $1; + if (WARN('NEEDLESS_IF', + "$func(NULL) is safe and this check is probably not required\n" . $hereprev) && + $fix) { + my $do_fix = 1; + my $leading_tabs = ""; + my $new_leading_tabs = ""; + if ($lines[$linenr - 2] =~ /^\+(\t*)if\s*\(\s*$tested\s*\)\s*$/) { + $leading_tabs = $1; + } else { + $do_fix = 0; + } + if ($lines[$linenr - 1] =~ /^\+(\t+)$func\s*\(\s*$tested\s*\)\s*;\s*$/) { + $new_leading_tabs = $1; + if (length($leading_tabs) + 1 ne length($new_leading_tabs)) { + $do_fix = 0; + } + } else { + $do_fix = 0; + } + if ($do_fix) { + fix_delete_line($fixlinenr - 1, $prevrawline); + $fixed[$fixlinenr] =~ s/^\+$new_leading_tabs/\+$leading_tabs/; + } + } + } + } + +# check for unnecessary "Out of Memory" messages + if ($line =~ /^\+.*\b$logFunctions\s*\(/ && + $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ && + (defined $1 || defined $3) && + $linenr > 3) { + my $testval = $2; + my $testline = $lines[$linenr - 3]; + + my ($s, $c) = ctx_statement_block($linenr - 3, $realcnt, 0); +# print("line: <$line>\nprevline: <$prevline>\ns: <$s>\nc: <$c>\n\n\n"); + + if ($s =~ /(?:^|\n)[ \+]\s*(?:$Type\s*)?\Q$testval\E\s*=\s*(?:\([^\)]*\)\s*)?\s*(?:devm_)?(?:[kv][czm]alloc(?:_node|_array)?\b|kstrdup|kmemdup|(?:dev_)?alloc_skb)/) { + WARN("OOM_MESSAGE", + "Possible unnecessary 'out of memory' message\n" . $hereprev); + } + } + +# check for logging functions with KERN_<LEVEL> + if ($line !~ /printk(?:_ratelimited|_once)?\s*\(/ && + $line =~ /\b$logFunctions\s*\(.*\b(KERN_[A-Z]+)\b/) { + my $level = $1; + if (WARN("UNNECESSARY_KERN_LEVEL", + "Possible unnecessary $level\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\s*$level\s*//; + } + } + +# check for logging continuations + if ($line =~ /\bprintk\s*\(\s*KERN_CONT\b|\bpr_cont\s*\(/) { + WARN("LOGGING_CONTINUATION", + "Avoid logging continuation uses where feasible\n" . $herecurr); + } + +# check for mask then right shift without a parentheses + if ($^V && $^V ge 5.10.0 && + $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ && + $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so + WARN("MASK_THEN_SHIFT", + "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr); + } + +# check for pointer comparisons to NULL + if ($^V && $^V ge 5.10.0) { + while ($line =~ /\b$LvalOrFunc\s*(==|\!=)\s*NULL\b/g) { + my $val = $1; + my $equal = "!"; + $equal = "" if ($4 eq "!="); + if (CHK("COMPARISON_TO_NULL", + "Comparison to NULL could be written \"${equal}${val}\"\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\b\Q$val\E\s*(?:==|\!=)\s*NULL\b/$equal$val/; + } } } @@ -3960,7 +5405,7 @@ sub process { WARN("MISPLACED_INIT", "$attr should be placed after $var\n" . $herecurr))) && $fix) { - $fixed[$linenr - 1] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e; + $fixed[$fixlinenr] =~ s/(\bstatic\s+(?:const\s+)?)(?:$attr\s+)?($NonptrTypeWithAttr)\s+(?:$attr\s+)?($Ident(?:\[[^]]*\])?)\s*([=;])\s*/"$1" . trim(string_find_replace($2, "\\s*$attr\\s*", " ")) . " " . trim(string_find_replace($3, "\\s*$attr\\s*", "")) . " $attr" . ("$4" eq ";" ? ";" : " = ")/e; } } } @@ -3974,7 +5419,7 @@ sub process { if (ERROR("INIT_ATTRIBUTE", "Use of const init definition must use ${attr_prefix}initconst\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/$InitAttributeData/${attr_prefix}initconst/; } } @@ -3985,21 +5430,49 @@ sub process { if (ERROR("INIT_ATTRIBUTE", "Use of $attr requires a separate use of const\n" . $herecurr) && $fix) { - my $lead = $fixed[$linenr - 1] =~ + my $lead = $fixed[$fixlinenr] =~ /(^\+\s*(?:static\s+))/; $lead = rtrim($1); $lead = "$lead " if ($lead !~ /^\+$/); $lead = "${lead}const "; - $fixed[$linenr - 1] =~ s/(^\+\s*(?:static\s+))/$lead/; + $fixed[$fixlinenr] =~ s/(^\+\s*(?:static\s+))/$lead/; + } + } + +# check for __read_mostly with const non-pointer (should just be const) + if ($line =~ /\b__read_mostly\b/ && + $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) { + if (ERROR("CONST_READ_MOSTLY", + "Invalid use of __read_mostly with const type\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\s+__read_mostly\b//; + } + } + +# don't use __constant_<foo> functions outside of include/uapi/ + if ($realfile !~ m@^include/uapi/@ && + $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) { + my $constant_func = $1; + my $func = $constant_func; + $func =~ s/^__constant_//; + if (WARN("CONSTANT_CONVERSION", + "$constant_func should be $func\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\b$constant_func\b/$func/g; } } # prefer usleep_range over udelay if ($line =~ /\budelay\s*\(\s*(\d+)\s*\)/) { + my $delay = $1; # ignore udelay's < 10, however - if (! ($1 < 10) ) { + if (! ($delay < 10) ) { CHK("USLEEP_RANGE", - "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line); + "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $herecurr); + } + if ($delay > 2000) { + WARN("LONG_UDELAY", + "long udelay - prefer mdelay; see arch/arm/include/asm/delay.h\n" . $herecurr); } } @@ -4007,7 +5480,7 @@ sub process { if ($line =~ /\bmsleep\s*\((\d+)\);/) { if ($1 < 20) { WARN("MSLEEP", - "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line); + "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $herecurr); } } @@ -4035,7 +5508,7 @@ sub process { if (ERROR("SPACING", "exactly one space required after that #$1\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ + $fixed[$fixlinenr] =~ s/^(.\s*\#\s*(ifdef|ifndef|elif))\s{2,}/$1 /; } @@ -4051,22 +5524,70 @@ sub process { } } # check for memory barriers without a comment. - if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) { + + my $barriers = qr{ + mb| + rmb| + wmb| + read_barrier_depends + }x; + my $barrier_stems = qr{ + mb__before_atomic| + mb__after_atomic| + store_release| + load_acquire| + store_mb| + (?:$barriers) + }x; + my $all_barriers = qr{ + (?:$barriers)| + smp_(?:$barrier_stems)| + virt_(?:$barrier_stems) + }x; + + if ($line =~ /\b(?:$all_barriers)\s*\(/) { if (!ctx_has_comment($first_line, $linenr)) { WARN("MEMORY_BARRIER", "memory barrier without comment\n" . $herecurr); } } + + my $underscore_smp_barriers = qr{__smp_(?:$barrier_stems)}x; + + if ($realfile !~ m@^include/asm-generic/@ && + $realfile !~ m@/barrier\.h$@ && + $line =~ m/\b(?:$underscore_smp_barriers)\s*\(/ && + $line !~ m/^.\s*\#\s*define\s+(?:$underscore_smp_barriers)\s*\(/) { + WARN("MEMORY_BARRIER", + "__smp memory barriers shouldn't be used outside barrier.h and asm-generic\n" . $herecurr); + } + +# check for waitqueue_active without a comment. + if ($line =~ /\bwaitqueue_active\s*\(/) { + if (!ctx_has_comment($first_line, $linenr)) { + WARN("WAITQUEUE_ACTIVE", + "waitqueue_active without comment\n" . $herecurr); + } + } + # check of hardware specific defines if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) { CHK("ARCH_DEFINES", "architecture specific defines should be avoided\n" . $herecurr); } +# check that the storage class is not after a type + if ($line =~ /\b($Type)\s+($Storage)\b/) { + WARN("STORAGE_CLASS", + "storage class '$2' should be located before type '$1'\n" . $herecurr); + } # Check that the storage class is at the beginning of a declaration - if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) { + if ($line =~ /\b$Storage\b/ && + $line !~ /^.\s*$Storage/ && + $line =~ /^.\s*(.+?)\$Storage\s/ && + $1 !~ /[\,\)]\s*$/) { WARN("STORAGE_CLASS", - "storage class should be at the beginning of the declaration\n" . $herecurr) + "storage class should be at the beginning of the declaration\n" . $herecurr); } # check the location of the inline attribute, that it is between @@ -4083,7 +5604,7 @@ sub process { if (WARN("INLINE", "plain inline is preferred over $1\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\b(__inline__|__inline)\b/inline/; + $fixed[$fixlinenr] =~ s/\b(__inline__|__inline)\b/inline/; } } @@ -4094,11 +5615,6 @@ sub process { WARN("PREFER_PACKED", "__packed is preferred over __attribute__((packed))\n" . $herecurr); } -# Check for new packed members, warn to use care - if ($line =~ /\b(__attribute__\s*\(\s*\(.*\bpacked|__packed)\b/) { - WARN("NEW_PACKED", - "Adding new packed members is to be done with care\n" . $herecurr); - } # Check for __attribute__ aligned, prefer __aligned if ($realfile !~ m@\binclude/uapi/@ && @@ -4113,7 +5629,7 @@ sub process { if (WARN("PREFER_PRINTF", "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex; + $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.*)\)\s*\)\s*\)/"__printf(" . trim($1) . ")"/ex; } } @@ -4124,7 +5640,55 @@ sub process { if (WARN("PREFER_SCANF", "__scanf(string-index, first-to-check) is preferred over __attribute__((format(scanf, string-index, first-to-check)))\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex; + $fixed[$fixlinenr] =~ s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*scanf\s*,\s*(.*)\)\s*\)\s*\)/"__scanf(" . trim($1) . ")"/ex; + } + } + +# Check for __attribute__ weak, or __weak declarations (may have link issues) + if ($^V && $^V ge 5.10.0 && + $line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ && + ($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ || + $line =~ /\b__weak\b/)) { + ERROR("WEAK_DECLARATION", + "Using weak declarations can have unintended link defects\n" . $herecurr); + } + +# check for c99 types like uint8_t used outside of uapi/ and tools/ + if ($realfile !~ m@\binclude/uapi/@ && + $realfile !~ m@\btools/@ && + $line =~ /\b($Declare)\s*$Ident\s*[=;,\[]/) { + my $type = $1; + if ($type =~ /\b($typeC99Typedefs)\b/) { + $type = $1; + my $kernel_type = 'u'; + $kernel_type = 's' if ($type =~ /^_*[si]/); + $type =~ /(\d+)/; + $kernel_type .= $1; + if (CHK("PREFER_KERNEL_TYPES", + "Prefer kernel type '$kernel_type' over '$type'\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\b$type\b/$kernel_type/; + } + } + } + +# check for cast of C90 native int or longer types constants + if ($line =~ /(\(\s*$C90_int_types\s*\)\s*)($Constant)\b/) { + my $cast = $1; + my $const = $2; + if (WARN("TYPECAST_INT_CONSTANT", + "Unnecessary typecast of c90 int constant\n" . $herecurr) && + $fix) { + my $suffix = ""; + my $newconst = $const; + $newconst =~ s/${Int_type}$//; + $suffix .= 'U' if ($cast =~ /\bunsigned\b/); + if ($cast =~ /\blong\s+long\b/) { + $suffix .= 'LL'; + } elsif ($cast =~ /\blong\b/) { + $suffix .= 'L'; + } + $fixed[$fixlinenr] =~ s/\Q$cast\E$const\b/$newconst$suffix/; } } @@ -4139,16 +5703,10 @@ sub process { if (WARN("SIZEOF_PARENTHESIS", "sizeof $1 should be sizeof($1)\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex; + $fixed[$fixlinenr] =~ s/\bsizeof\s+((?:\*\s*|)$Lval|$Type(?:\s+$Lval|))/"sizeof(" . trim($1) . ")"/ex; } } -# check for line continuations in quoted strings with odd counts of " - if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) { - WARN("LINE_CONTINUATIONS", - "Avoid line continuations in quoted strings\n" . $herecurr); - } - # check for struct spinlock declarations if ($line =~ /^.\s*\bstruct\s+spinlock\s+\w+\s*;/) { WARN("USE_SPINLOCK_T", @@ -4158,19 +5716,46 @@ sub process { # check for seq_printf uses that could be seq_puts if ($sline =~ /\bseq_printf\s*\(.*"\s*\)\s*;\s*$/) { my $fmt = get_quoted_string($line, $rawline); - if ($fmt ne "" && $fmt !~ /[^\\]\%/) { + $fmt =~ s/%%//g; + if ($fmt !~ /%/) { if (WARN("PREFER_SEQ_PUTS", "Prefer seq_puts to seq_printf\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\bseq_printf\b/seq_puts/; + $fixed[$fixlinenr] =~ s/\bseq_printf\b/seq_puts/; } } } + # check for vsprintf extension %p<foo> misuses + if ($^V && $^V ge 5.10.0 && + defined $stat && + $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s && + $1 !~ /^_*volatile_*$/) { + my $bad_extension = ""; + my $lc = $stat =~ tr@\n@@; + $lc = $lc + $linenr; + for (my $count = $linenr; $count <= $lc; $count++) { + my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0)); + $fmt =~ s/%%//g; + if ($fmt =~ /(\%[\*\d\.]*p(?![\WFfSsBKRraEhMmIiUDdgVCbGNO]).)/) { + $bad_extension = $1; + last; + } + } + if ($bad_extension ne "") { + my $stat_real = raw_line($linenr, 0); + for (my $count = $linenr + 1; $count <= $lc; $count++) { + $stat_real = $stat_real . "\n" . raw_line($count, 0); + } + WARN("VSPRINTF_POINTER_EXTENSION", + "Invalid vsprintf pointer extension '$bad_extension'\n" . "$here\n$stat_real\n"); + } + } + # Check for misused memsets if ($^V && $^V ge 5.10.0 && defined $stat && - $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) { + $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/) { my $ms_addr = $2; my $ms_val = $7; @@ -4186,14 +5771,46 @@ sub process { } # Check for memcpy(foo, bar, ETH_ALEN) that could be ether_addr_copy(foo, bar) - if ($^V && $^V ge 5.10.0 && - $line =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) { - if (WARN("PREFER_ETHER_ADDR_COPY", - "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . $herecurr) && - $fix) { - $fixed[$linenr - 1] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/; - } - } +# if ($^V && $^V ge 5.10.0 && +# defined $stat && +# $stat =~ /^\+(?:.*?)\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) { +# if (WARN("PREFER_ETHER_ADDR_COPY", +# "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . "$here\n$stat\n") && +# $fix) { +# $fixed[$fixlinenr] =~ s/\bmemcpy\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/ether_addr_copy($2, $7)/; +# } +# } + +# Check for memcmp(foo, bar, ETH_ALEN) that could be ether_addr_equal*(foo, bar) +# if ($^V && $^V ge 5.10.0 && +# defined $stat && +# $stat =~ /^\+(?:.*?)\bmemcmp\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) { +# WARN("PREFER_ETHER_ADDR_EQUAL", +# "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . "$here\n$stat\n") +# } + +# check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr +# check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr +# if ($^V && $^V ge 5.10.0 && +# defined $stat && +# $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/) { +# +# my $ms_val = $7; +# +# if ($ms_val =~ /^(?:0x|)0+$/i) { +# if (WARN("PREFER_ETH_ZERO_ADDR", +# "Prefer eth_zero_addr over memset()\n" . "$here\n$stat\n") && +# $fix) { +# $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($2)/; +# } +# } elsif ($ms_val =~ /^(?:0xff|255)$/i) { +# if (WARN("PREFER_ETH_BROADCAST_ADDR", +# "Prefer eth_broadcast_addr() over memset()\n" . "$here\n$stat\n") && +# $fix) { +# $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($2)/; +# } +# } +# } # typecasts on min/max could be min_t/max_t if ($^V && $^V ge 5.10.0 && @@ -4238,7 +5855,7 @@ sub process { # check for naked sscanf if ($^V && $^V ge 5.10.0 && defined $stat && - $stat =~ /\bsscanf\b/ && + $line =~ /\bsscanf\b/ && ($stat !~ /$Ident\s*=\s*sscanf\s*$balanced_parens/ && $stat !~ /\bsscanf\s*$balanced_parens\s*(?:$Compare)/ && $stat !~ /(?:$Compare)\s*\bsscanf\s*$balanced_parens/)) { @@ -4252,13 +5869,34 @@ sub process { "unchecked sscanf return value\n" . "$here\n$stat_real\n"); } +# check for simple sscanf that should be kstrto<foo> + if ($^V && $^V ge 5.10.0 && + defined $stat && + $line =~ /\bsscanf\b/) { + my $lc = $stat =~ tr@\n@@; + $lc = $lc + $linenr; + my $stat_real = raw_line($linenr, 0); + for (my $count = $linenr + 1; $count <= $lc; $count++) { + $stat_real = $stat_real . "\n" . raw_line($count, 0); + } + if ($stat_real =~ /\bsscanf\b\s*\(\s*$FuncArg\s*,\s*("[^"]+")/) { + my $format = $6; + my $count = $format =~ tr@%@%@; + if ($count == 1 && + $format =~ /^"\%(?i:ll[udxi]|[udxi]ll|ll|[hl]h?[udxi]|[udxi][hl]h?|[hl]h?|[udxi])"$/) { + WARN("SSCANF_TO_KSTRTO", + "Prefer kstrto<type> to single variable sscanf\n" . "$here\n$stat_real\n"); + } + } + } + # check for new externs in .h files. if ($realfile =~ /\.h$/ && $line =~ /^\+\s*(extern\s+)$Type\s*$Ident\s*\(/s) { if (CHK("AVOID_EXTERNS", "extern prototypes should be avoided in .h files\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/(.*)\bextern\b\s*(.*)/$1$2/; + $fixed[$fixlinenr] =~ s/(.*)\bextern\b\s*(.*)/$1$2/; } } @@ -4292,13 +5930,50 @@ sub process { "externs should be avoided in .c files\n" . $herecurr); } +# check for function declarations that have arguments without identifier names + if (defined $stat && + $stat =~ /^.\s*(?:extern\s+)?$Type\s*$Ident\s*\(\s*([^{]+)\s*\)\s*;/s && + $1 ne "void") { + my $args = trim($1); + while ($args =~ m/\s*($Type\s*(?:$Ident|\(\s*\*\s*$Ident?\s*\)\s*$balanced_parens)?)/g) { + my $arg = trim($1); + if ($arg =~ /^$Type$/ && $arg !~ /enum\s+$Ident$/) { + WARN("FUNCTION_ARGUMENTS", + "function definition argument '$arg' should also have an identifier name\n" . $herecurr); + } + } + } + +# check for function definitions + if ($^V && $^V ge 5.10.0 && + defined $stat && + $stat =~ /^.\s*(?:$Storage\s+)?$Type\s*($Ident)\s*$balanced_parens\s*{/s) { + $context_function = $1; + +# check for multiline function definition with misplaced open brace + my $ok = 0; + my $cnt = statement_rawlines($stat); + my $herectx = $here . "\n"; + for (my $n = 0; $n < $cnt; $n++) { + my $rl = raw_line($linenr, $n); + $herectx .= $rl . "\n"; + $ok = 1 if ($rl =~ /^[ \+]\{/); + $ok = 1 if ($rl =~ /\{/ && $n == 0); + last if $rl =~ /^[ \+].*\{/; + } + if (!$ok) { + ERROR("OPEN_BRACE", + "open brace '{' following function definitions go on the next line\n" . $herectx); + } + } + # checks for new __setup's if ($rawline =~ /\b__setup\("([^"]*)"/) { my $name = $1; if (!grep(/$name/, @setup_docs)) { CHK("UNDOCUMENTED_SETUP", - "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr); + "__setup appears un-documented -- check Documentation/admin-guide/kernel-parameters.rst\n" . $herecurr); } } @@ -4316,6 +5991,38 @@ sub process { "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr); } +# check for k[mz]alloc with multiplies that could be kmalloc_array/kcalloc + if ($^V && $^V ge 5.10.0 && + defined $stat && + $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) { + my $oldfunc = $3; + my $a1 = $4; + my $a2 = $10; + my $newfunc = "kmalloc_array"; + $newfunc = "kcalloc" if ($oldfunc eq "kzalloc"); + my $r1 = $a1; + my $r2 = $a2; + if ($a1 =~ /^sizeof\s*\S/) { + $r1 = $a2; + $r2 = $a1; + } + if ($r1 !~ /^sizeof\b/ && $r2 =~ /^sizeof\s*\S/ && + !($r1 =~ /^$Constant$/ || $r1 =~ /^[A-Z_][A-Z0-9_]*$/)) { + my $ctx = ''; + my $herectx = $here . "\n"; + my $cnt = statement_rawlines($stat); + for (my $n = 0; $n < $cnt; $n++) { + $herectx .= raw_line($linenr, $n) . "\n"; + } + if (WARN("ALLOC_WITH_MULTIPLY", + "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) && + $cnt == 1 && + $fix) { + $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*(k[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e; + } + } + } + # check for krealloc arg reuse if ($^V && $^V ge 5.10.0 && $line =~ /\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*krealloc\s*\(\s*\1\s*,/) { @@ -4329,18 +6036,34 @@ sub process { "$1 uses number as first arg, sizeof is generally wrong\n" . $herecurr); } -# check for GFP_NOWAIT use - if ($line =~ /\b__GFP_NOFAIL\b/) { - WARN("__GFP_NOFAIL", - "Use of __GFP_NOFAIL is deprecated, no new users should be added\n" . $herecurr); - } - # check for multiple semicolons if ($line =~ /;\s*;\s*$/) { if (WARN("ONE_SEMICOLON", "Statements terminations use 1 semicolon\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/(\s*;\s*){2,}$/;/g; + $fixed[$fixlinenr] =~ s/(\s*;\s*){2,}$/;/g; + } + } + +# check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi + if ($realfile !~ m@^include/uapi/@ && + $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) { + my $ull = ""; + $ull = "_ULL" if (defined($1) && $1 =~ /ll/i); + if (CHK("BIT_MACRO", + "Prefer using the BIT$ull macro\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/; + } + } + +# check for #if defined CONFIG_<FOO> || defined CONFIG_<FOO>_MODULE + if ($line =~ /^\+\s*#\s*if\s+defined(?:\s*\(?\s*|\s+)(CONFIG_[A-Z_]+)\s*\)?\s*\|\|\s*defined(?:\s*\(?\s*|\s+)\1_MODULE\s*\)?\s*$/) { + my $config = $1; + if (WARN("PREFER_IS_ENABLED", + "Prefer IS_ENABLED(<FOO>) to CONFIG_<FOO> || CONFIG_<FOO>_MODULE\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] = "\+#if IS_ENABLED($config)"; } } @@ -4350,7 +6073,7 @@ sub process { my $has_statement = 0; my $count = 0; my $prevline = $linenr; - while ($prevline > 1 && $count < 3 && !$has_break) { + while ($prevline > 1 && ($file || $count < 3) && !$has_break) { $prevline--; my $rline = $rawlines[$prevline - 1]; my $fline = $lines[$prevline - 1]; @@ -4388,10 +6111,16 @@ sub process { if (WARN("USE_FUNC", "__func__ should be used instead of gcc specific __FUNCTION__\n" . $herecurr) && $fix) { - $fixed[$linenr - 1] =~ s/\b__FUNCTION__\b/__func__/g; + $fixed[$fixlinenr] =~ s/\b__FUNCTION__\b/__func__/g; } } +# check for uses of __DATE__, __TIME__, __TIMESTAMP__ + while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) { + ERROR("DATE_TIME", + "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr); + } + # check for use of yield() if ($line =~ /\byield\s*\(\s*\)/) { WARN("YIELD", @@ -4437,55 +6166,18 @@ sub process { "$1 is obsolete, use k$3 instead\n" . $herecurr); } -# check for __initcall(), use device_initcall() explicitly please +# check for __initcall(), use device_initcall() explicitly or more appropriate function please if ($line =~ /^.\s*__initcall\s*\(/) { WARN("USE_DEVICE_INITCALL", - "please use device_initcall() instead of __initcall()\n" . $herecurr); - } - -# check for various ops structs, ensure they are const. - my $struct_ops = qr{acpi_dock_ops| - address_space_operations| - backlight_ops| - block_device_operations| - dentry_operations| - dev_pm_ops| - dma_map_ops| - extent_io_ops| - file_lock_operations| - file_operations| - hv_ops| - ide_dma_ops| - intel_dvo_dev_ops| - item_operations| - iwl_ops| - kgdb_arch| - kgdb_io| - kset_uevent_ops| - lock_manager_operations| - microcode_ops| - mtrr_ops| - neigh_ops| - nlmsvc_binding| - pci_raw_ops| - pipe_buf_operations| - platform_hibernation_ops| - platform_suspend_ops| - proto_ops| - rpc_pipe_ops| - seq_operations| - snd_ac97_build_ops| - soc_pcmcia_socket_ops| - stacktrace_ops| - sysfs_ops| - tty_operations| - usb_mon_operations| - wd_ops}x; + "please use device_initcall() or more appropriate function instead of __initcall() (see include/linux/init.h)\n" . $herecurr); + } + +# check for various structs that are normally const (ops, kgdb, device_tree) +# and avoid what seem like struct definitions 'struct foo {' if ($line !~ /\bconst\b/ && - $line =~ /\bstruct\s+($struct_ops)\b/) { + $line =~ /\bstruct\s+($const_structs)\b(?!\s*\{)/) { WARN("CONST_STRUCT", - "struct $1 should normally be const\n" . - $herecurr); + "struct $1 should normally be const\n" . $herecurr); } # use of NR_CPUS is usually wrong @@ -4507,16 +6199,11 @@ sub process { "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $herecurr); } -# check for %L{u,d,i} in strings - my $string; - while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) { - $string = substr($rawline, $-[1], $+[1] - $-[1]); - $string =~ s/%%/__/g; - if ($string =~ /(?<!%)%L[udi]/) { - WARN("PRINTF_L", - "\%Ld/%Lu are not-standard C, use %lld/%llu\n" . $herecurr); - last; - } +# likely/unlikely comparisons similar to "(likely(foo) > 0)" + if ($^V && $^V ge 5.10.0 && + $line =~ /\b((?:un)?likely)\s*\(\s*$FuncArg\s*\)\s*$Compare/) { + WARN("LIKELY_MISUSE", + "Using $1 should generally have parentheses around the comparison\n" . $herecurr); } # whine mightly about in_atomic @@ -4530,6 +6217,34 @@ sub process { } } +# whine about ACCESS_ONCE + if ($^V && $^V ge 5.10.0 && + $line =~ /\bACCESS_ONCE\s*$balanced_parens\s*(=(?!=))?\s*($FuncArg)?/) { + my $par = $1; + my $eq = $2; + my $fun = $3; + $par =~ s/^\(\s*(.*)\s*\)$/$1/; + if (defined($eq)) { + if (WARN("PREFER_WRITE_ONCE", + "Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR>\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)\s*$eq\s*\Q$fun\E/WRITE_ONCE($par, $fun)/; + } + } else { + if (WARN("PREFER_READ_ONCE", + "Prefer READ_ONCE(<FOO>) over ACCESS_ONCE(<FOO>)\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)/READ_ONCE($par)/; + } + } + } + +# check for mutex_trylock_recursive usage + if ($line =~ /mutex_trylock_recursive/) { + ERROR("LOCKING", + "recursive locking is bad, do not use this ever.\n" . $herecurr); + } + # check for lockdep_set_novalidate_class if ($line =~ /^.\s*lockdep_set_novalidate_class\s*\(/ || $line =~ /__lockdep_no_validate__\s*\)/ ) { @@ -4541,11 +6256,95 @@ sub process { } } - if ($line =~ /debugfs_create_file.*S_IWUGO/ || - $line =~ /DEVICE_ATTR.*S_IWUGO/ ) { + if ($line =~ /debugfs_create_\w+.*\b$mode_perms_world_writable\b/ || + $line =~ /DEVICE_ATTR.*\b$mode_perms_world_writable\b/) { WARN("EXPORTED_WORLD_WRITABLE", "Exporting world writable files is usually an error. Consider more restrictive permissions.\n" . $herecurr); } + +# Mode permission misuses where it seems decimal should be octal +# This uses a shortcut match to avoid unnecessary uses of a slow foreach loop + if ($^V && $^V ge 5.10.0 && + defined $stat && + $line =~ /$mode_perms_search/) { + foreach my $entry (@mode_permission_funcs) { + my $func = $entry->[0]; + my $arg_pos = $entry->[1]; + + my $lc = $stat =~ tr@\n@@; + $lc = $lc + $linenr; + my $stat_real = raw_line($linenr, 0); + for (my $count = $linenr + 1; $count <= $lc; $count++) { + $stat_real = $stat_real . "\n" . raw_line($count, 0); + } + + my $skip_args = ""; + if ($arg_pos > 1) { + $arg_pos--; + $skip_args = "(?:\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}"; + } + my $test = "\\b$func\\s*\\(${skip_args}($FuncArg(?:\\|\\s*$FuncArg)*)\\s*[,\\)]"; + if ($stat =~ /$test/) { + my $val = $1; + $val = $6 if ($skip_args ne ""); + if (($val =~ /^$Int$/ && $val !~ /^$Octal$/) || + ($val =~ /^$Octal$/ && length($val) ne 4)) { + ERROR("NON_OCTAL_PERMISSIONS", + "Use 4 digit octal (0777) not decimal permissions\n" . "$here\n" . $stat_real); + } + if ($val =~ /^$Octal$/ && (oct($val) & 02)) { + ERROR("EXPORTED_WORLD_WRITABLE", + "Exporting writable files is usually an error. Consider more restrictive permissions.\n" . "$here\n" . $stat_real); + } + } + } + } + +# check for uses of S_<PERMS> that could be octal for readability + if ($line =~ /\b$mode_perms_string_search\b/) { + my $val = ""; + my $oval = ""; + my $to = 0; + my $curpos = 0; + my $lastpos = 0; + while ($line =~ /\b(($mode_perms_string_search)\b(?:\s*\|\s*)?\s*)/g) { + $curpos = pos($line); + my $match = $2; + my $omatch = $1; + last if ($lastpos > 0 && ($curpos - length($omatch) != $lastpos)); + $lastpos = $curpos; + $to |= $mode_permission_string_types{$match}; + $val .= '\s*\|\s*' if ($val ne ""); + $val .= $match; + $oval .= $omatch; + } + $oval =~ s/^\s*\|\s*//; + $oval =~ s/\s*\|\s*$//; + my $octal = sprintf("%04o", $to); + if (WARN("SYMBOLIC_PERMS", + "Symbolic permissions '$oval' are not preferred. Consider using octal permissions '$octal'.\n" . $herecurr) && + $fix) { + $fixed[$fixlinenr] =~ s/$val/$octal/; + } + } + +# validate content of MODULE_LICENSE against list from include/linux/module.h + if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) { + my $extracted_string = get_quoted_string($line, $rawline); + my $valid_licenses = qr{ + GPL| + GPL\ v2| + GPL\ and\ additional\ rights| + Dual\ BSD/GPL| + Dual\ MIT/GPL| + Dual\ MPL/GPL| + Proprietary + }x; + if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) { + WARN("MODULE_LICENSE", + "unknown module license " . $extracted_string . "\n" . $herecurr); + } + } } # If we have no input at all, then there is nothing to report on @@ -4566,11 +6365,11 @@ sub process { exit(0); } - if (!$is_patch) { + if (!$is_patch && $file !~ /cover-letter\.patch$/) { ERROR("NOT_UNIFIED_DIFF", "Does not appear to be a unified-diff format patch\n"); } - if ($is_patch && $chk_signoff && $signoff == 0) { + if ($is_patch && $has_commit_log && $chk_signoff && $signoff == 0) { ERROR("MISSING_SIGN_OFF", "Missing Signed-off-by: line(s)\n"); } @@ -4581,34 +6380,39 @@ sub process { print "total: $cnt_error errors, $cnt_warn warnings, " . (($check)? "$cnt_chk checks, " : "") . "$cnt_lines lines checked\n"; - print "\n" if ($quiet == 0); } if ($quiet == 0) { + # If there were any defects found and not already fixing them + if (!$clean and !$fix) { + print << "EOM" - if ($^V lt 5.10.0) { - print("NOTE: perl $^V is not modern enough to detect all possible issues.\n"); - print("An upgrade to at least perl v5.10.0 is suggested.\n\n"); +NOTE: For some of the reported defects, checkpatch may be able to + mechanically convert to the typical style using --fix or --fix-inplace. +EOM } - # If there were whitespace errors which cleanpatch can fix # then suggest that. if ($rpt_cleaners) { - print "NOTE: whitespace errors detected, you may wish to use scripts/cleanpatch or\n"; - print " scripts/cleanfile\n\n"; $rpt_cleaners = 0; + print << "EOM" + +NOTE: Whitespace errors detected. + You may wish to use scripts/cleanpatch or scripts/cleanfile +EOM } } - hash_show_words(\%use_type, "Used"); - hash_show_words(\%ignore_type, "Ignored"); - - if ($clean == 0 && $fix && "@rawlines" ne "@fixed") { + if ($clean == 0 && $fix && + ("@rawlines" ne "@fixed" || + $#fixed_inserted >= 0 || $#fixed_deleted >= 0)) { my $newfile = $filename; $newfile .= ".EXPERIMENTAL-checkpatch-fixes" if (!$fix_inplace); my $linecount = 0; my $f; + @fixed = fix_inserted_deleted_lines(\@fixed, \@fixed_inserted, \@fixed_deleted); + open($f, '>', $newfile) or die "$P: Can't open $newfile for write\n"; foreach my $fixed_line (@fixed) { @@ -4616,7 +6420,7 @@ sub process { if ($file) { if ($linecount > 3) { $fixed_line =~ s/^\+//; - print $f $fixed_line. "\n"; + print $f $fixed_line . "\n"; } } else { print $f $fixed_line . "\n"; @@ -4626,6 +6430,7 @@ sub process { if (!$quiet) { print << "EOM"; + Wrote EXPERIMENTAL --fix correction(s) to '$newfile' Do _NOT_ trust the results written to this file. @@ -4633,22 +6438,17 @@ Do _NOT_ submit these changes without inspecting them for correctness. This EXPERIMENTAL file is simply a convenience to help rewrite patches. No warranties, expressed or implied... - EOM } } - if ($clean == 1 && $quiet == 0) { - print "$vname has no obvious style problems and is ready for submission.\n" - } - if ($clean == 0 && $quiet == 0) { - print << "EOM"; -$vname has style problems, please review. - -If any of these errors are false positives, please report -them to the maintainer, see CHECKPATCH in MAINTAINERS. -EOM + if ($quiet == 0) { + print "\n"; + if ($clean == 1) { + print "$vname has no obvious style problems and is ready for submission.\n"; + } else { + print "$vname has style problems, please review.\n"; + } } - return $clean; } diff --git a/scripts/const_structs.checkpatch b/scripts/const_structs.checkpatch new file mode 100644 index 00000000000..da775bca0cd --- /dev/null +++ b/scripts/const_structs.checkpatch @@ -0,0 +1,2 @@ +# Put structs here that should be constant +__dummy__ |