--- 26e2f3705cc159e75324c28e3caacfdfea379484
+++ f5e362f12fe25a198f2b70a2c197e48aa4009f9c
@@ -168,8 +168,15 @@ int __read_mostly timekeeping_suspended;
 static struct timespec xtime_cache __attribute__ ((aligned (16)));
 void update_xtime_cache(u64 nsec)
 {
-	xtime_cache = xtime;
-	timespec_add_ns(&xtime_cache, nsec);
+	/*
+	 * Use temporary variable so get_seconds() cannot catch
+	 * an intermediate xtime_cache.tv_sec value.
+	 * The ACCESS_ONCE() keeps the compiler from optimizing
+	 * out the intermediate value.
+	 */
+	struct timespec ts = xtime;
+	timespec_add_ns(&ts, nsec);
+	ACCESS_ONCE(xtime_cache) = ts;
 }
 
 /* must hold xtime_lock */