[PATCH] sched: unlikely corrupted stack end

WANG Chao
2016-06-14T06:43:23Z

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