Messages in this thread Patch in this message | | | Date | Tue, 19 Mar 2013 04:39:29 -0700 | From | tip-bot for Thomas Gleixner <> | Subject | [tip:timers/core] arm: Use tick broadcast expired check |
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Commit-ID: 80bbe9f273a38f83ecfc50fe384a57f8428887bd Gitweb: http://git.kernel.org/tip/80bbe9f273a38f83ecfc50fe384a57f8428887bd Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Wed, 6 Mar 2013 11:18:37 +0000 Committer: Thomas Gleixner <tglx@linutronix.de> 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@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
--- 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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