Avoid going back into deep idle if the tick broadcast IPI is about to
fire.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
arch/arm/kernel/process.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
Index: tip/arch/arm/kernel/process.c
===================================================================
--- tip.orig/arch/arm/kernel/process.c
+++ tip/arch/arm/kernel/process.c
@@ -199,7 +199,16 @@ void cpu_idle(void)
#ifdef CONFIG_PL310_ERRATA_769419
wmb();
#endif
- if (hlt_counter) {
+ /*
+ * In poll mode we reenable interrupts and spin.
+ *
+ * Also if we detected in the wakeup from idle
+ * path that the tick broadcast device expired
+ * for us, we don't want to go deep idle as we
+ * know that the IPI is going to arrive right
+ * away
+ */
+ if (hlt_counter || tick_check_broadcast_expired()) {
local_irq_enable();
cpu_relax();
} else if (!need_resched()) {
--
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