--- 8cff36119e4d50f7336a06e8d01e59e8b162e694
+++ b7474f32e11ca6a7e044d5eb8119c5c1ccb6e6e0
@@ -763,7 +763,7 @@ unsigned long apply_slack(struct timer_l
 	if (mask == 0)
 		return expires;
 
-	bit = find_last_bit(&mask, BITS_PER_LONG);
+	bit = __fls(mask);
 
 	mask = (1 << bit) - 1;