Commit-ID: 80bbe9f273a38f83ecfc50fe384a57f8428887bd
Gitweb: http://git.kernel.org/tip/80bbe9f273a38f83ecfc50fe384a57f8428887bd
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 6 Mar 2013 11:18:37 +0000
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 13 Mar 2013 11:39:40 +0100
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@xxxxxxxxxxxxx>
Cc: LAK <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Arjan van de Veen <arjan@xxxxxxxxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Tested-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Jason Liu <liu.h.jason@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20130306111537.640722922@xxxxxxxxxxxxx
---
arch/arm/kernel/process.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 047d3e4..db4ffd0 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()) {
--
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