Commit af4b67da authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Reduce min_delta for the arch clockevent device 



Now the min_delta is 0x600 (1536) for LoongArch's constant clockevent
device. For a 100MHz hardware timer this means ~15us. This is a little
big, especially for PREEMPT_RT enabled kernels. So reduce it to 100 for
PREEMPT_RT kernel, and 1000 for others (we don't want too small values
to affect performance).

Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 73c359d1

arch/loongarch/kernel/time.c

+5 −1
Original line number Diff line number Diff line
@@ -127,7 +127,11 @@ void sync_counter(void) 
int constant_clockevent_init(void)

{

	unsigned int cpu = smp_processor_id();

	unsigned long min_delta = 0x600;

#ifdef CONFIG_PREEMPT_RT

	unsigned long min_delta = 100;

#else

	unsigned long min_delta = 1000;

#endif

	unsigned long max_delta = (1UL << 48) - 1;

	struct clock_event_device *cd;

	static int irq = 0, timer_irq_installed = 0;