time: prevent the loop in timespec_add_ns() from being optimised away Since some architectures don't support __udivdi3(). --- a/include/linux/time.h +++ b/include/linux/time.h @@ -170,6 +170,10 @@ static inline void timespec_add_ns(struc { 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++; }