From 88ca8e7402aa6899de20ddc8e708831225583f8d Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sat, 14 Oct 2006 10:33:10 +0200 Subject: [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 Signed-off-by: Adrian Bunk --- arch/sparc64/kernel/time.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/sparc64') diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index a22930d62adf..0af3b8384e2b 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -1039,7 +1039,7 @@ 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(); -- cgit v1.2.3