From 35b61edb41ffee58711850e76215b852386ddb10 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 6 Mar 2013 11:18:37 +0000 Subject: [PATCH] x86: Use tick broadcast expired check Avoid going back into deep idle if the tick broadcast IPI is about to fire. Signed-off-by: Thomas Gleixner Cc: John Stultz Cc: Arjan van de Veen Cc: x86@kernel.org Link: http://lkml.kernel.org/r/20130306111537.702278273@linutronix.de --- arch/x86/kernel/process.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 14ae10031ff0..aa524da03bba 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -336,6 +336,18 @@ void cpu_idle(void) local_touch_nmi(); local_irq_disable(); + /* + * We detected in the wakeup path that the + * tick broadcast device expired for us, but + * we raced with the other CPU and came back + * here before it was able to fire the IPI. + * No point in going idle. + */ + if (tick_check_broadcast_expired()) { + local_irq_enable(); + continue; + } + enter_idle(); /* Don't trace irqs off for idle */ -- GitLab