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| author | Thomas Gleixner <tglx@linutronix.de> | 2013-03-06 12:18:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-03-13 11:39:40 +0100 |
| commit | 80bbe9f273a38f83ecfc50fe384a57f8428887bd (patch) | |
| tree | 9f45dc17809949d9b4fb1f434b93052ac750c8a7 /arch | |
| parent | tick: Provide a check for a forced broadcast pending (diff) | |
| download | linux-80bbe9f273a38f83ecfc50fe384a57f8428887bd.tar.xz linux-80bbe9f273a38f83ecfc50fe384a57f8428887bd.zip | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/process.c | 11 |
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()) { |