linux-kernel - [PATCH] sched: unlikely corrupted stack end

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Message-Id: <20160614064306.48035-1-wcwxyz@gmail.com>
Date:	Tue, 14 Jun 2016 14:43:06 +0800
From:	WANG Chao <wcwxyz@...il.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] sched: unlikely corrupted stack end

unlikely() was dropped in commit ce03e41 ("sched/core: Drop unlikely
behind BUG_ON()"), but commit 29d6455 ("sched: panic on corrupted stack
end") dropped BUG_ON() and called panic directly.

Now we should bring unlikely() back for branch prediction.

Signed-off-by: WANG Chao <wcwxyz@...il.com>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 017d539..7db442c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3170,7 +3170,7 @@ static noinline void __schedule_bug(struct task_struct *prev)
 static inline void schedule_debug(struct task_struct *prev)
 {
 #ifdef CONFIG_SCHED_STACK_END_CHECK
-	if (task_stack_end_corrupted(prev))
+	if (unlikely(task_stack_end_corrupted(prev)))
 		panic("corrupted stack end detected inside scheduler\n");
 #endif
 
-- 
2.8.4