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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-02-04 12:31:27 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-03-24 09:38:53 (GMT) |
commit | f153d017ab70d2954f5456278f3cbc39e6e060f3 (patch) | |
tree | 5f79237440dc2e3c47ef40f8d454d55054ea40f1 /arch | |
parent | 8211ca658728d03ba331de0276950289e52a1b0f (diff) | |
download | linux-fsl-qoriq-f153d017ab70d2954f5456278f3cbc39e6e060f3.tar.xz |
ARM: sync sched_clock() state on suspend
Ensure that the software state for sched_clock() is updated at the
point of suspend so that we avoid losing ticks since the last update.
This prevents the platform dependent possibility that sched_clock()
may appear to go backwards across a suspend/resume cycle.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/kernel/sched_clock.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c index 5416c7c..27d186a 100644 --- a/arch/arm/kernel/sched_clock.c +++ b/arch/arm/kernel/sched_clock.c @@ -10,6 +10,7 @@ #include <linux/jiffies.h> #include <linux/kernel.h> #include <linux/sched.h> +#include <linux/syscore_ops.h> #include <linux/timer.h> #include <asm/sched_clock.h> @@ -164,3 +165,20 @@ void __init sched_clock_postinit(void) sched_clock_poll(sched_clock_timer.data); } + +static int sched_clock_suspend(void) +{ + sched_clock_poll(sched_clock_timer.data); + return 0; +} + +static struct syscore_ops sched_clock_ops = { + .suspend = sched_clock_suspend, +}; + +static int __init sched_clock_syscore_init(void) +{ + register_syscore_ops(&sched_clock_ops); + return 0; +} +device_initcall(sched_clock_syscore_init); |