common implementation of iterative div/mod

[mirror_ubuntu-artful-kernel.git] / include / linux / time.h

diff --git a/include/linux/time.h b/include/linux/time.h
index d32ef0ad4c0aaf8964d94abe215c5dbf4dde8aaf..05f9517a8ed142b18df18e5723f0d9d0299a10bc 100644 (file)
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -6,6 +6,7 @@
 #ifdef __KERNEL__
 # include <linux/cache.h>
 # include <linux/seqlock.h>
+# include <linux/math64.h>
 #endif
 
 #ifndef _STRUCT_TIMESPEC
@@ -172,15 +173,7 @@ extern struct timeval ns_to_timeval(const s64 nsec);
  */
 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++;
-       }
+       a->tv_sec += iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
        a->tv_nsec = ns;
 }
 #endif /* __KERNEL__ */