commit 8512564b498417a1e6e9a4a228c20ffc667c3c0b
Author: Segher Boessenkool <[EMAIL PROTECTED]>
Date: Tue Mar 4 14:59:54 2008 -0800
time: prevent the loop in timespec_add_ns() from being optimised away
upstream commit: 38332cb98772f5ea757e6486bed7ed0381cb5f98
Since some architectures don't support __udivdi3().
Signed-off-by: Segher Boessenkool <[EMAIL PROTECTED]>
Cc: john stultz <[EMAIL PROTECTED]>
Cc: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
Cc: Sedat Dilek <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/include/linux/time.h b/include/linux/time.h
index b04136d..3e8fd9e 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -173,6 +173,10 @@ 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++;
}
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