1 files changed, 3 insertions, 2 deletions

diff --git a/arch/x86_64/vdso/vclock_gettime.c b/arch/x86_64/vdso/vclock_gettime.c
index 17f6a00de712..5b54cdfb2b07 100644
--- a/arch/x86_64/vdso/vclock_gettime.c
+++ b/arch/x86_64/vdso/vclock_gettime.c
@@ -34,10 +34,11 @@ static long vdso_fallback_gettime(long clock, struct timespec *ts)
 
 static inline long vgetns(void)
 {
+        long v;
         cycles_t (*vread)(void);
         vread = gtod->clock.vread;
-        return ((vread() - gtod->clock.cycle_last) * gtod->clock.mult) >>
-                gtod->clock.shift;
+        v = (vread() - gtod->clock.cycle_last) & gtod->clock.mask;
+        return (v * gtod->clock.mult) >> gtod->clock.shift;
 }
 
 static noinline int do_realtime(struct timespec *ts)