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Date: Tue, 6 Oct 2015 09:17:45 -0700 From: tip-bot for Geliang Tang <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: efault@....de, peterz@...radead.org, hpa@...or.com, linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, geliangtang@....com, mingo@...nel.org, tglx@...utronix.de Subject: [tip:sched/core] sched/core: Drop unlikely behind BUG_ON() Commit-ID: ce03e4137bb22fc560ad7a07cf4138ae2cd59f65 Gitweb: http://git.kernel.org/tip/ce03e4137bb22fc560ad7a07cf4138ae2cd59f65 Author: Geliang Tang <geliangtang@....com> AuthorDate: Mon, 5 Oct 2015 21:26:05 +0800 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Tue, 6 Oct 2015 17:08:22 +0200 sched/core: Drop unlikely behind BUG_ON() (1) For !CONFIG_BUG cases, the bug call is a no-op, so we couldn't care less and the change is ok. (2) PPC and MIPS, which HAVE_ARCH_BUG_ON, do not rely on branch predictions as it seems to be pointless [1] and thus callers should not be trying to push an optimization in the first place. (3) For CONFIG_BUG and !HAVE_ARCH_BUG_ON cases, BUG_ON() contains an unlikely compiler flag already. Hence, we can drop unlikely behind BUG_ON(). [1] http://lkml.iu.edu/hypermail/linux/kernel/1101.3/02289.html Signed-off-by: Geliang Tang <geliangtang@....com> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Mike Galbraith <efault@....de> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: linux-kernel@...r.kernel.org Link: http://lkml.kernel.org/r/6fa7125979f98bbeac26e268271769b6ca935c8d.1444051018.git.geliangtang@163.com Signed-off-by: Ingo Molnar <mingo@...nel.org> --- 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 fb14a01..a395db1 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2971,7 +2971,7 @@ static noinline void __schedule_bug(struct task_struct *prev) static inline void schedule_debug(struct task_struct *prev) { #ifdef CONFIG_SCHED_STACK_END_CHECK - BUG_ON(unlikely(task_stack_end_corrupted(prev))); + BUG_ON(task_stack_end_corrupted(prev)); #endif if (unlikely(in_atomic_preempt_off())) { -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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