diff options
| author | Stephen Boyd <sboyd@codeaurora.org> | 2013-07-18 16:21:18 -0700 |
|---|---|---|
| committer | Ajay Nandakumar <anandakumarm@nvidia.com> | 2014-01-13 12:03:37 +0530 |
| commit | 6220dca122e5d31ff3a167d14680e424664b8c7a (patch) | |
| tree | 4082e26409646a83a22b410ac1ba1fa0028addff /arch/arm/kernel | |
| parent | 9677b59f55e348c330eeb8cd9a6f7b2f613839a5 (diff) | |
arch_timer: Move to generic sched_clock framework
Register with the generic sched_clock framework now that it
supports 64 bits. This fixes two problems with the current
sched_clock support for machines using the architected timers.
First off, we don't subtract the start value from subsequent
sched_clock calls so we can potentially start off with
sched_clock returning gigantic numbers. Second, there is no
support for suspend/resume handling so problems such as discussed
in 6a4dae5 (ARM: 7565/1: sched: stop sched_clock() during
suspend, 2012-10-23) can happen without this patch. Finally, it
allows us to move the sched_clock setup into drivers clocksource
out of the arch ports.
Bug 1399318
Cc: Christopher Covington <cov@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
(cherry picked from commit 65cd4f6c99c1170bd0114dbd71b978012ea44d28)
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>
Change-Id: I77dde73ba0c325c67275e72220419fd47faf4206
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/arch_timer.c | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c index c501de6c4a1b..897ea98dd579 100644 --- a/arch/arm/kernel/arch_timer.c +++ b/arch/arm/kernel/arch_timer.c @@ -11,7 +11,6 @@ #include <linux/init.h> #include <linux/types.h> #include <linux/errno.h> -#include <linux/sched_clock.h> #include <asm/delay.h> @@ -22,13 +21,6 @@ static unsigned long arch_timer_read_counter_long(void) return arch_timer_read_counter(); } -static u32 sched_clock_mult __read_mostly; - -static unsigned long long notrace arch_timer_sched_clock(void) -{ - return arch_timer_read_counter() * sched_clock_mult; -} - static struct delay_timer arch_delay_timer; static void __init arch_timer_delay_timer_register(void) @@ -48,11 +40,5 @@ int __init arch_timer_arch_init(void) arch_timer_delay_timer_register(); - /* Cache the sched_clock multiplier to save a divide in the hot path. */ - sched_clock_mult = NSEC_PER_SEC / arch_timer_rate; - sched_clock_func = arch_timer_sched_clock; - pr_info("sched_clock: ARM arch timer >56 bits at %ukHz, resolution %uns\n", - arch_timer_rate / 1000, sched_clock_mult); - return 0; } |