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authorMatthias Maennich2019-09-06 11:32:32 +0100
committerJessica Yu2019-09-10 10:30:43 +0200
commiteb8305aecb958e8787e7d603c7765c1dcace3a2b (patch)
tree03a29689498344ac197a953e3eb748d4d58794fc
parent1d082773ff30e97c8bc10b65c4aa0d073664caac (diff)
scripts: Coccinelle script for namespace dependencies.
A script that uses the '<module>.ns_deps' files generated by modpost to automatically add the required symbol namespace dependencies to each module. Usage: 1) Move some symbols to a namespace with EXPORT_SYMBOL_NS() or define DEFAULT_SYMBOL_NAMESPACE 2) Run 'make' (or 'make modules') and get warnings about modules not importing that namespace. 3) Run 'make nsdeps' to automatically add required import statements to said modules. This makes it easer for subsystem maintainers to introduce and maintain symbol namespaces into their codebase. Co-developed-by: Martijn Coenen <maco@android.com> Signed-off-by: Martijn Coenen <maco@android.com> Acked-by: Julia Lawall <julia.lawall@lip6.fr> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Matthias Maennich <maennich@google.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
-rw-r--r--MAINTAINERS5
-rw-r--r--Makefile12
-rw-r--r--scripts/Makefile.modpost4
-rw-r--r--scripts/coccinelle/misc/add_namespace.cocci23
-rw-r--r--scripts/nsdeps58
5 files changed, 101 insertions, 1 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index e7a47b5210fd..3b170c11a0e6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11436,6 +11436,11 @@ S: Maintained
T: git git://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/nolibc.git
F: tools/include/nolibc/
+NSDEPS
+M: Matthias Maennich <maennich@google.com>
+S: Maintained
+F: scripts/nsdeps
+
NTB AMD DRIVER
M: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
L: linux-ntb@googlegroups.com
diff --git a/Makefile b/Makefile
index 0cdb957ae2c3..014d55b400ca 100644
--- a/Makefile
+++ b/Makefile
@@ -1500,6 +1500,9 @@ help:
@echo ' headerdep - Detect inclusion cycles in headers'
@echo ' coccicheck - Check with Coccinelle'
@echo ''
+ @echo 'Tools:'
+ @echo ' nsdeps - Generate missing symbol namespace dependencies'
+ @echo ''
@echo 'Kernel selftest:'
@echo ' kselftest - Build and run kernel selftest (run as root)'
@echo ' Build, install, and boot kernel before'
@@ -1687,6 +1690,15 @@ quiet_cmd_tags = GEN $@
tags TAGS cscope gtags: FORCE
$(call cmd,tags)
+# Script to generate missing namespace dependencies
+# ---------------------------------------------------------------------------
+
+PHONY += nsdeps
+
+nsdeps: modules
+ $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
+
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 26e6574ecd08..743fe3a2e885 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -56,7 +56,8 @@ MODPOST = scripts/mod/modpost \
$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS))) \
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
- $(if $(KBUILD_MODPOST_WARN),-w)
+ $(if $(KBUILD_MODPOST_WARN),-w) \
+ $(if $(filter nsdeps,$(MAKECMDGOALS)),-d)
ifdef MODPOST_VMLINUX
@@ -134,6 +135,7 @@ $(modules): %.ko :%.o %.mod.o FORCE
targets += $(modules)
+nsdeps: __modpost
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------
diff --git a/scripts/coccinelle/misc/add_namespace.cocci b/scripts/coccinelle/misc/add_namespace.cocci
new file mode 100644
index 000000000000..c832bb6445a8
--- /dev/null
+++ b/scripts/coccinelle/misc/add_namespace.cocci
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+/// Adds missing MODULE_IMPORT_NS statements to source files
+///
+/// This script is usually called from scripts/nsdeps with -D ns=<namespace> to
+/// add a missing namespace tag to a module source file.
+///
+
+@has_ns_import@
+declarer name MODULE_IMPORT_NS;
+identifier virtual.ns;
+@@
+MODULE_IMPORT_NS(ns);
+
+// Add missing imports, but only adjacent to a MODULE_LICENSE statement.
+// That ensures we are adding it only to the main module source file.
+@do_import depends on !has_ns_import@
+declarer name MODULE_LICENSE;
+expression license;
+identifier virtual.ns;
+@@
+MODULE_LICENSE(license);
++ MODULE_IMPORT_NS(ns);
diff --git a/scripts/nsdeps b/scripts/nsdeps
new file mode 100644
index 000000000000..ac2b6031dd13
--- /dev/null
+++ b/scripts/nsdeps
@@ -0,0 +1,58 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Linux kernel symbol namespace import generator
+#
+# This script requires a minimum spatch version.
+SPATCH_REQ_VERSION="1.0.4"
+
+DIR="$(dirname $(readlink -f $0))/.."
+SPATCH="`which ${SPATCH:=spatch}`"
+if [ ! -x "$SPATCH" ]; then
+ echo 'spatch is part of the Coccinelle project and is available at http://coccinelle.lip6.fr/'
+ exit 1
+fi
+
+SPATCH_REQ_VERSION_NUM=$(echo $SPATCH_REQ_VERSION | ${DIR}/scripts/ld-version.sh)
+SPATCH_VERSION=$($SPATCH --version | head -1 | awk '{print $3}')
+SPATCH_VERSION_NUM=$(echo $SPATCH_VERSION | ${DIR}/scripts/ld-version.sh)
+
+if [ "$SPATCH_VERSION_NUM" -lt "$SPATCH_REQ_VERSION_NUM" ] ; then
+ echo "spatch needs to be version $SPATCH_REQ_VERSION or higher"
+ exit 1
+fi
+
+generate_deps_for_ns() {
+ $SPATCH --very-quiet --in-place --sp-file \
+ $srctree/scripts/coccinelle/misc/add_namespace.cocci -D ns=$1 $2
+}
+
+generate_deps() {
+ local mod_name=`basename $@ .ko`
+ local mod_file=`echo $@ | sed -e 's/\.ko/\.mod/'`
+ local ns_deps_file=`echo $@ | sed -e 's/\.ko/\.ns_deps/'`
+ if [ ! -f "$ns_deps_file" ]; then return; fi
+ local mod_source_files=`cat $mod_file | sed -n 1p \
+ | sed -e 's/\.o/\.c/g' \
+ | sed "s/[^ ]* */${srctree}\/&/g"`
+ for ns in `cat $ns_deps_file`; do
+ echo "Adding namespace $ns to module $mod_name (if needed)."
+ generate_deps_for_ns $ns $mod_source_files
+ # sort the imports
+ for source_file in $mod_source_files; do
+ sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
+ offset=$(wc -l ${source_file}.tmp | awk '{print $1;}')
+ cat $source_file | grep MODULE_IMPORT_NS | sort -u >> ${source_file}.tmp
+ tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp
+ if ! diff -q ${source_file} ${source_file}.tmp; then
+ mv ${source_file}.tmp ${source_file}
+ else
+ rm ${source_file}.tmp
+ fi
+ done
+ done
+}
+
+for f in `cat $objtree/modules.order`; do
+ generate_deps $f
+done
+