diff options
| -rw-r--r-- | mm/page_io.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/page_io.c b/mm/page_io.c index 6c1c1828bb88..ff8c99ee3af7 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -382,7 +382,12 @@ void __swap_writepage(struct folio *folio, struct writeback_control *wbc) */ if (data_race(sis->flags & SWP_FS_OPS)) swap_writepage_fs(folio, wbc); - else if (sis->flags & SWP_SYNCHRONOUS_IO) + /* + * ->flags can be updated non-atomicially (scan_swap_map_slots), + * but that will never affect SWP_SYNCHRONOUS_IO, so the data_race + * is safe. + */ + else if (data_race(sis->flags & SWP_SYNCHRONOUS_IO)) swap_writepage_bdev_sync(folio, wbc, sis); else swap_writepage_bdev_async(folio, wbc, sis); |