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From: WANG Chao <wcwxyz@gmail.com>
To: Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] sched: unlikely corrupted stack end
Date: Tue, 14 Jun 2016 14:43:06 +0800	[thread overview]
Message-ID: <20160614064306.48035-1-wcwxyz@gmail.com> (raw)

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@gmail.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

             reply	other threads:[~2016-06-14  6:43 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14  6:43 WANG Chao [this message]
2016-06-14  7:43 ` Ingo Molnar
2016-06-14  8:17 ` Peter Zijlstra
2016-06-14  8:24 ` [PATCH v2] " WANG Chao
2016-06-14  8:56   ` Ingo Molnar
2016-06-14 10:17     ` WANG Chao
2016-06-14 10:26       ` Ingo Molnar
2016-06-14 16:55         ` WANG Chao
2016-06-15  8:25           ` Ingo Molnar
2016-06-15  8:53             ` [PATCH v3] " WANG Chao
2016-06-14  9:08   ` [PATCH v2] " kbuild test robot

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