diff options
| -rw-r--r-- | mm/page-writeback.c | 5 |
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: |