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| author | Thomas Gleixner | 2013-03-06 12:18:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner | 2013-03-13 11:39:40 +0100 |
| commit | 35b61edb41ffee58711850e76215b852386ddb10 (patch) | |
| tree | 781f01d855ca8185dc071bddd89282655f73fdcf | |
| parent | arm: Use tick broadcast expired check (diff) | |
| download | kernel-qcow2-linux-35b61edb41ffee58711850e76215b852386ddb10.tar.gz kernel-qcow2-linux-35b61edb41ffee58711850e76215b852386ddb10.tar.xz kernel-qcow2-linux-35b61edb41ffee58711850e76215b852386ddb10.zip | |
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 <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Arjan van de Veen <arjan@infradead.org>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20130306111537.702278273@linutronix.de
| -rw-r--r-- | arch/x86/kernel/process.c | 12 |
1 files changed, 12 insertions, 0 deletions
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 */ |