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-rw-r--r--mm/page-writeback.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 936dc7b61dc6..0ae2008eb540 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -822,6 +822,11 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi,
*/
balanced_dirty_ratelimit = div_u64((u64)task_ratelimit * write_bw,
dirty_rate | 1);
+ /*
+ * balanced_dirty_ratelimit ~= (write_bw / N) <= write_bw
+ */
+ if (unlikely(balanced_dirty_ratelimit > write_bw))
+ balanced_dirty_ratelimit = write_bw;
/*
* We could safely do this and return immediately: