diff options
| author | Steven Rostedt <srostedt@redhat.com> | 2011-04-29 22:35:33 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-03 10:33:35 +0900 |
| commit | e5664c3da9affbcca581c9a9d4a7a5dae3ca8826 (patch) | |
| tree | 4f5bdec4e39f80d8d4e0eb38b790169b88aaa1a2 /kernel | |
| parent | ad8ba6a764a5bb3a1e6f878b489b7842081e33fc (diff) | |
ftrace: Only update the function code on write to filter files
commit 058e297d34a404caaa5ed277de15698d8dc43000 upstream.
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.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'kernel')
| -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 888b611897d..9803b68dbc3 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2414,14 +2414,16 @@ 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; } |