tracing: Use free_percpu instead of kfree

In the event->profile_enable() failure path, we release the per cpu
buffers using kfree which is wrong because they are per cpu pointers.
Although free_percpu only wraps kfree for now, that may change in the
future so lets use the correct way.

Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>

diff --git a/kernel/trace/trace_event_profile.c b/kernel/trace/trace_event_profile.c
index e52784b..8d5c171 100644 (file)
--- a/kernel/trace/trace_event_profile.c
+++ b/kernel/trace/trace_event_profile.c
@@ -53,8 +53,8 @@ static int ftrace_profile_enable_event(struct ftrace_event_call *event)
 
 fail_buf_nmi:
        if (!total_profile_count) {
-               kfree(trace_profile_buf_nmi);
-               kfree(trace_profile_buf);
+               free_percpu(trace_profile_buf_nmi);
+               free_percpu(trace_profile_buf);
                trace_profile_buf_nmi = NULL;
                trace_profile_buf = NULL;
        }