Commit-ID: 35b61edb41ffee58711850e76215b852386ddb10 Gitweb: http://git.kernel.org/tip/35b61edb41ffee58711850e76215b852386ddb10 Author: Thomas Gleixner <[email protected]> AuthorDate: Wed, 6 Mar 2013 11:18:37 +0000 Committer: Thomas Gleixner <[email protected]> CommitDate: Wed, 13 Mar 2013 11:39:40 +0100
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 <[email protected]> Cc: John Stultz <[email protected]> Cc: Arjan van de Veen <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] --- 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 14ae100..aa524da 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
