diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index e9825ff57b155d75153a7217b2354fcbfda914a6..69bea82ebeb127160a1a5a69d93e54edce29b797 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -660,12 +660,14 @@ static inline void blkg_rwstat_reset(struct blkg_rwstat *rwstat)
 static inline void blkg_rwstat_add_aux(struct blkg_rwstat *to,
 				       struct blkg_rwstat *from)
 {
-	struct blkg_rwstat v = blkg_rwstat_read(from);
+	u64 sum[BLKG_RWSTAT_NR];
 	int i;
 
 	for (i = 0; i < BLKG_RWSTAT_NR; i++)
-		atomic64_add(atomic64_read(&v.aux_cnt[i]) +
-			     atomic64_read(&from->aux_cnt[i]),
+		sum[i] = percpu_counter_sum_positive(&from->cpu_cnt[i]);
+
+	for (i = 0; i < BLKG_RWSTAT_NR; i++)
+		atomic64_add(sum[i] + atomic64_read(&from->aux_cnt[i]),
 			     &to->aux_cnt[i]);
 }