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authorSegher Boessenkool <segher@kernel.crashing.org>2008-03-05 01:59:54 +0300
committerThomas Gleixner <tglx@linutronix.de>2008-03-09 10:42:57 +0300
commit38332cb98772f5ea757e6486bed7ed0381cb5f98 (patch)
tree5690b915ed9e9a64e67520df70329081900dca85 /include/linux/time.h
parente48af19f56eb47a1f908ee8f16df9d246f955b21 (diff)
downloadlinux-38332cb98772f5ea757e6486bed7ed0381cb5f98.tar.xz
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>
Diffstat (limited to 'include/linux/time.h')
-rw-r--r--include/linux/time.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
index 2091a19f1655..d32ef0ad4c0a 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -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++;
}