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18 lines
480 B
Diff
18 lines
480 B
Diff
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time: prevent the loop in timespec_add_ns() from being optimised away
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Since some architectures don't support __udivdi3().
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--- a/include/linux/time.h
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+++ b/include/linux/time.h
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@@ -170,6 +170,10 @@ static inline void timespec_add_ns(struc
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{
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ns += a->tv_nsec;
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while(unlikely(ns >= NSEC_PER_SEC)) {
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+ /* The following asm() prevents the compiler from
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+ * optimising this loop into a modulo operation. */
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+ asm("" : "+r"(ns));
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+
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ns -= NSEC_PER_SEC;
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a->tv_sec++;
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}
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