diff options
author | Linus Torvalds | 2022-07-12 16:17:40 -0700 |
---|---|---|
committer | Linus Torvalds | 2022-07-12 16:17:40 -0700 |
commit | b047602d579b4fb028128a525f056bbdc890e7f0 (patch) | |
tree | e3dac342d77e53bb5681135b49a43ff100ef9cd0 | |
parent | 72a8e05d4f66b5af7854df4490e3135168694b6b (diff) | |
parent | 1e1fb420fe68d9d938db360fec700dfd230cc22a (diff) |
Merge tag 'trace-v5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
"Fixes and minor clean ups for tracing:
- Fix memory leak by reverting what was thought to be a double free.
A static tool had gave a false positive that a double free was
possible in the error path, but it was actually a different
location that confused the static analyzer (and those of us that
reviewed it).
- Move use of static buffers by ftrace_dump() to a location that can
be used by kgdb's ftdump(), as it needs it for the same reasons.
- Clarify in the Kconfig description that function tracing has
negligible impact on x86, but may have a bit bigger impact on other
architectures.
- Remove unnecessary extra semicolon in trace event.
- Make a local variable static that is used in the fprobes sample
- Use KSYM_NAME_LEN for length of function in kprobe sample and get
rid of unneeded macro for the same purpose"
* tag 'trace-v5.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
samples: Use KSYM_NAME_LEN for kprobes
fprobe/samples: Make sample_probe static
blk-iocost: tracing: atomic64_read(&ioc->vtime_rate) is assigned an extra semicolon
ftrace: Be more specific about arch impact when function tracer is enabled
tracing: Fix sleeping while atomic in kdb ftdump
tracing/histograms: Fix memory leak problem
-rw-r--r-- | include/trace/events/iocost.h | 2 | ||||
-rw-r--r-- | kernel/trace/Kconfig | 3 | ||||
-rw-r--r-- | kernel/trace/trace.c | 11 | ||||
-rw-r--r-- | kernel/trace/trace_events_hist.c | 2 | ||||
-rw-r--r-- | samples/fprobe/fprobe_example.c | 2 | ||||
-rw-r--r-- | samples/kprobes/kprobe_example.c | 5 | ||||
-rw-r--r-- | samples/kprobes/kretprobe_example.c | 5 |
7 files changed, 16 insertions, 14 deletions
diff --git a/include/trace/events/iocost.h b/include/trace/events/iocost.h index e282ce02fa2d..6d1626e7a4ce 100644 --- a/include/trace/events/iocost.h +++ b/include/trace/events/iocost.h @@ -160,7 +160,7 @@ TRACE_EVENT(iocost_ioc_vrate_adj, TP_fast_assign( __assign_str(devname, ioc_name(ioc)); - __entry->old_vrate = atomic64_read(&ioc->vtime_rate);; + __entry->old_vrate = atomic64_read(&ioc->vtime_rate); __entry->new_vrate = new_vrate; __entry->busy_level = ioc->busy_level; __entry->read_missed_ppm = missed_ppm[READ]; diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index debbbb083286..ccd6a5ade3e9 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -194,7 +194,8 @@ config FUNCTION_TRACER sequence is then dynamically patched into a tracer call when tracing is enabled by the administrator. If it's runtime disabled (the bootup default), then the overhead of the instructions is very - small and not measurable even in micro-benchmarks. + small and not measurable even in micro-benchmarks (at least on + x86, but may have impact on other architectures). config FUNCTION_GRAPH_TRACER bool "Kernel Function Graph Tracer" diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a8cfac0611bc..b8dd54627075 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9864,6 +9864,12 @@ void trace_init_global_iter(struct trace_iterator *iter) /* Output in nanoseconds only if we are using a clock in nanoseconds. */ if (trace_clocks[iter->tr->clock_id].in_ns) iter->iter_flags |= TRACE_FILE_TIME_IN_NS; + + /* Can not use kmalloc for iter.temp and iter.fmt */ + iter->temp = static_temp_buf; + iter->temp_size = STATIC_TEMP_BUF_SIZE; + iter->fmt = static_fmt_buf; + iter->fmt_size = STATIC_FMT_BUF_SIZE; } void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) @@ -9896,11 +9902,6 @@ void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) /* Simulate the iterator */ trace_init_global_iter(&iter); - /* Can not use kmalloc for iter.temp and iter.fmt */ - iter.temp = static_temp_buf; - iter.temp_size = STATIC_TEMP_BUF_SIZE; - iter.fmt = static_fmt_buf; - iter.fmt_size = STATIC_FMT_BUF_SIZE; for_each_tracing_cpu(cpu) { atomic_inc(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 48e82e141d54..e87a46794079 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -4430,6 +4430,8 @@ static int parse_var_defs(struct hist_trigger_data *hist_data) s = kstrdup(field_str, GFP_KERNEL); if (!s) { + kfree(hist_data->attrs->var_defs.name[n_vars]); + hist_data->attrs->var_defs.name[n_vars] = NULL; ret = -ENOMEM; goto free; } diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_example.c index 18b1e5c4b431..e22da8573116 100644 --- a/samples/fprobe/fprobe_example.c +++ b/samples/fprobe/fprobe_example.c @@ -20,7 +20,7 @@ #define BACKTRACE_DEPTH 16 #define MAX_SYMBOL_LEN 4096 -struct fprobe sample_probe; +static struct fprobe sample_probe; static unsigned long nhit; static char symbol[MAX_SYMBOL_LEN] = "kernel_clone"; diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c index f991a66b5b02..fd346f58ddba 100644 --- a/samples/kprobes/kprobe_example.c +++ b/samples/kprobes/kprobe_example.c @@ -16,9 +16,8 @@ #include <linux/module.h> #include <linux/kprobes.h> -#define MAX_SYMBOL_LEN 64 -static char symbol[MAX_SYMBOL_LEN] = "kernel_clone"; -module_param_string(symbol, symbol, sizeof(symbol), 0644); +static char symbol[KSYM_NAME_LEN] = "kernel_clone"; +module_param_string(symbol, symbol, KSYM_NAME_LEN, 0644); /* For each probe you need to allocate a kprobe structure */ static struct kprobe kp = { diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c index 228321ecb161..cbf16542d84e 100644 --- a/samples/kprobes/kretprobe_example.c +++ b/samples/kprobes/kretprobe_example.c @@ -23,11 +23,10 @@ #include <linux/module.h> #include <linux/kprobes.h> #include <linux/ktime.h> -#include <linux/limits.h> #include <linux/sched.h> -static char func_name[NAME_MAX] = "kernel_clone"; -module_param_string(func, func_name, NAME_MAX, S_IRUGO); +static char func_name[KSYM_NAME_LEN] = "kernel_clone"; +module_param_string(func, func_name, KSYM_NAME_LEN, 0644); MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the" " function's execution time"); |