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>

diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c
index c4d9f95..6cd1b30 100644 (file)
--- 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()));