[patch 6/7] arm: Use tick broadcast expired check

[Thomas Gleixner]

Avoid going back into deep idle if the tick broadcast IPI is about to
fire.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 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()) {


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/