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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>
This commit is contained in:
Russell King 2012-02-04 12:31:27 +00:00
parent 8211ca6587
commit f153d017ab
1 changed files with 18 additions and 0 deletions
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18
arch/arm/kernel/sched_clock.c
View File

@ -10,6 +10,7 @@
#include <linux/jiffies.h> #include <linux/jiffies.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/syscore_ops.h>
#include <linux/timer.h> #include <linux/timer.h>
#include <asm/sched_clock.h> #include <asm/sched_clock.h>
@ -164,3 +165,20 @@ void __init sched_clock_postinit(void)
sched_clock_poll(sched_clock_timer.data); 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);