Commit-ID: 980097b36074596c76c1367a9e7b70ec8583d55b
Gitweb: http://git.kernel.org/tip/980097b36074596c76c1367a9e7b70ec8583d55b
Author: Linus Walleij <linus.walleij@xxxxxxxxxx>
AuthorDate: Mon, 29 Oct 2012 15:24:18 +0100
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Tue, 13 Nov 2012 14:04:52 -0500
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@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
drivers/clocksource/arm_generic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c
index c4d9f95..6cd1b30 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()));
--
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