diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2012-10-29 15:24:18 +0100 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2012-11-13 14:04:52 -0500 |
| commit | 980097b36074596c76c1367a9e7b70ec8583d55b (patch) | |
| tree | 361546a15dd634ff684a607707bfdc4f45605197 | |
| parent | f95a985781e9e986992351c971af7f7e46e06ed5 (diff) | |
| download | linux-3.10-980097b36074596c76c1367a9e7b70ec8583d55b.tar.gz linux-3.10-980097b36074596c76c1367a9e7b70ec8583d55b.tar.bz2 linux-3.10-980097b36074596c76c1367a9e7b70ec8583d55b.zip | |
clocksource: arm_generic: use integer math helpers
This will make the two crucial integer divisions in the generic
ARM arch timer used for ARMv8 use the kernel DIV_ROUND_CLOSEST()
helper inline from <linux/kernel.h> so they get more precise.
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
| -rw-r--r-- | drivers/clocksource/arm_generic.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c index c4d9f9566c6..6cd1b30e01a 100644 --- a/drivers/clocksource/arm_generic.c +++ b/drivers/clocksource/arm_generic.c @@ -127,7 +127,7 @@ static void __init arch_timer_calibrate(void) /* Cache the sched_clock multiplier to save a divide in the hot path. */ - sched_clock_mult = NSEC_PER_SEC / arch_timer_rate; + sched_clock_mult = DIV_ROUND_CLOSEST(NSEC_PER_SEC, arch_timer_rate); pr_info("Architected local timer running at %u.%02uMHz.\n", arch_timer_rate / 1000000, (arch_timer_rate / 10000) % 100); @@ -221,7 +221,7 @@ int __init arm_generic_timer_init(void) clocksource_register_hz(&clocksource_counter, arch_timer_rate); /* Calibrate the delay loop directly */ - lpj_fine = arch_timer_rate / HZ; + lpj_fine = DIV_ROUND_CLOSEST(arch_timer_rate, HZ); /* Immediately configure the timer on the boot CPU */ arch_timer_setup(per_cpu_ptr(&arch_timer_evt, smp_processor_id())); |