From e17ba8f51f69782abc4575dd30848ba5eafaa797 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 23 Sep 2006 18:31:42 -0700 Subject: [PATCH] [SPARC64]: Fix sched_clock() wrapping every ~17 seconds. Unfortunately, sparc64 doesn't have an easy way to do a "64 X 64 --> 128" bit multiply like PowerPC and IA64 do. We were doing a "64 X 64 --> 64" bit multiple which causes overflow very quickly with a 30-bit quotient shift. So use a quotientshift count of 10 instead of 30, just like x86 and ARM do. This also fixes the wrapping of printk timestamp values every ~17 seconds. Signed-off-by: David S. Miller --- arch/sparc64/kernel/time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index 094d3e35be18..b0b4feeec098 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -983,7 +983,7 @@ static struct time_interpolator sparc64_cpu_interpolator = { }; /* The quotient formula is taken from the IA64 port. */ -#define SPARC64_NSEC_PER_CYC_SHIFT 30UL +#define SPARC64_NSEC_PER_CYC_SHIFT 10UL void __init time_init(void) { unsigned long clock = sparc64_init_timers(); -- GitLab