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| author | Steven Rostedt <srostedt@redhat.com> | 2011-04-29 22:35:33 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2011-04-29 22:42:59 -0400 |
| commit | 058e297d34a404caaa5ed277de15698d8dc43000 (patch) | |
| tree | 0a4cfa547a4cf466f8c746978ff5fe464cbe88ab | |
| parent | 2bce5daca28346f19c190dbdb5542c9fe3e8c6e6 (diff) | |
| download | linux-stable-058e297d34a404caaa5ed277de15698d8dc43000.tar.gz linux-stable-058e297d34a404caaa5ed277de15698d8dc43000.tar.bz2 linux-stable-058e297d34a404caaa5ed277de15698d8dc43000.zip | |
ftrace: Only update the function code on write to filter files
If function tracing is enabled, a read of the filter files will
cause the call to stop_machine to update the function trace sites.
It should only call stop_machine on write.
Cc: stable@kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/ftrace.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index ee24fa1935ac..666880d051ef 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2413,14 +2413,16 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable) ftrace_match_records(parser->buffer, parser->idx, enable); } - mutex_lock(&ftrace_lock); - if (ftrace_start_up && ftrace_enabled) - ftrace_run_update_code(FTRACE_ENABLE_CALLS); - mutex_unlock(&ftrace_lock); - trace_parser_put(parser); kfree(iter); + if (file->f_mode & FMODE_WRITE) { + mutex_lock(&ftrace_lock); + if (ftrace_start_up && ftrace_enabled) + ftrace_run_update_code(FTRACE_ENABLE_CALLS); + mutex_unlock(&ftrace_lock); + } + mutex_unlock(&ftrace_regex_lock); return 0; } |