From: Nicholas Piggin Date: Wed, 14 Jun 2017 13:02:39 +0000 (+1000) Subject: cpuidle: powerpc: cpuidle set polling before enabling irqs X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3fc5ee927ff4ffed6aa2fcd44d2fbf07ac893cdc;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git cpuidle: powerpc: cpuidle set polling before enabling irqs local_irq_enable can cause interrupts to be taken which could take significant amount of processing time. The idle process should set its polling flag before this, so another process that wakes it during this time will not have to send an IPI. Expand the TIF_POLLING_NRFLAG coverage to as large as possible. Reviewed-by: Gautham R. Shenoy Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman --- diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c index 79152676f62b..50b3c2e0306f 100644 --- a/drivers/cpuidle/cpuidle-powernv.c +++ b/drivers/cpuidle/cpuidle-powernv.c @@ -51,9 +51,10 @@ static int snooze_loop(struct cpuidle_device *dev, { u64 snooze_exit_time; - local_irq_enable(); set_thread_flag(TIF_POLLING_NRFLAG); + local_irq_enable(); + snooze_exit_time = get_tb() + snooze_timeout; ppc64_runlatch_off(); HMT_very_low(); @@ -66,6 +67,7 @@ static int snooze_loop(struct cpuidle_device *dev, ppc64_runlatch_on(); clear_thread_flag(TIF_POLLING_NRFLAG); smp_mb(); + return index; } diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c index 166ccd711ec9..7b12bb2ea70f 100644 --- a/drivers/cpuidle/cpuidle-pseries.c +++ b/drivers/cpuidle/cpuidle-pseries.c @@ -62,9 +62,10 @@ static int snooze_loop(struct cpuidle_device *dev, unsigned long in_purr; u64 snooze_exit_time; + set_thread_flag(TIF_POLLING_NRFLAG); + idle_loop_prolog(&in_purr); local_irq_enable(); - set_thread_flag(TIF_POLLING_NRFLAG); snooze_exit_time = get_tb() + snooze_timeout; while (!need_resched()) {