arm: 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: LAK <linux-arm-kernel@lists.infradead.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Arjan van de Veen <arjan@infradead.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Jason Liu <liu.h.jason@gmail.com>
Link: http://lkml.kernel.org/r/20130306111537.640722922@linutronix.de

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 047d3e40e470..db4ffd09ee23 100644
--- a/arch/arm/kernel/process.c
+++ b/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()) {