Avoid going back into deep idle if the tick broadcast IPI is about to
fire.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: x...@kernel.org
---
arch/x86/kernel/process.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
Index: tip/arch/x86/kernel/process.c
===================================================================
--- tip.orig/arch/x86/kernel/process.c
+++ tip/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 */
--
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