Commit 38332cb9 authored Mar 04, 2008 by Segher Boessenkool Committed by Thomas Gleixner Mar 09, 2008

time: prevent the loop in timespec_add_ns() from being optimised away



Since some architectures don't support __udivdi3().

Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent e48af19f

include/linux/time.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -174,6 +174,10 @@ static inline void timespec_add_ns(struct timespec *a, u64 ns)
		{
		ns += a->tv_nsec;
		while(unlikely(ns >= NSEC_PER_SEC)) {
		/* The following asm() prevents the compiler from
		* optimising this loop into a modulo operation. */
		asm("" : "+r"(ns));

		ns -= NSEC_PER_SEC;
		a->tv_sec++;
		}