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Commit 980097b3 authored by Linus Walleij's avatar Linus Walleij Committed by John Stultz
Browse files

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: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent f95a9857

drivers/clocksource/arm_generic.c

+2 −2
Original line number Diff line number Diff line
@@ -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()));