Commit 058e297d authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
Browse files

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: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 2bce5dac

kernel/trace/ftrace.c

+7 −5
Original line number Diff line number Diff line
@@ -2413,13 +2413,15 @@ ftrace_regex_release(struct inode *inode, struct file *file, int enable) 
		ftrace_match_records(parser->buffer, parser->idx, enable);

	}



	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);



	trace_parser_put(parser);

	kfree(iter);

	}



	mutex_unlock(&ftrace_regex_lock);

	return 0;