From: Lai Jiangshan <laijs@cn.fujitsu.com>
Date: Thu, 27 Nov 2008 02:21:46 +0000 (+0800)
Subject: ftrace: prevent recursion
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4f5a7f40ddbae98569acbb99118a98570315579c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

ftrace: prevent recursion

Impact: prevent unnecessary stack recursion

if the resched flag was set before we entered, then don't reschedule.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index f780e9552f91..668bbb5ef2bd 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -1215,7 +1215,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
 
  out:
 	if (resched)
-		preempt_enable_notrace();
+		preempt_enable_no_resched_notrace();
 	else
 		preempt_enable_notrace();
 	return NULL;