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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>
This commit is contained in:
Steven Rostedt 2011-04-29 22:35:33 -04:00 committed by Steven Rostedt
parent 2bce5daca2
commit 058e297d34
1 changed files with 7 additions and 5 deletions
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12
kernel/trace/ftrace.c
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@ -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;
}