[PATCH 5.12 115/700] fuse: ignore PG_workingset after stealing

[Greg Kroah-Hartman]

From: Miklos Szeredi <mszeredi@xxxxxxxxxx>

commit b89ecd60d38ec042d63bdb376c722a16f92bcb88 upstream.

Fix the "fuse: trying to steal weird page" warning.

Description from Johannes Weiner:

  "Think of it as similar to PG_active. It's just another usage/heat
   indicator of file and anon pages on the reclaim LRU that, unlike
   PG_active, persists across deactivation and even reclaim (we store it in
   the page cache / swapper cache tree until the page refaults).

   So if fuse accepts pages that can legally have PG_active set,
   PG_workingset is fine too."

Reported-by: Thomas Lindroth <thomas.lindroth@xxxxxxxxx>
Fixes: 1899ad18c607 ("mm: workingset: tell cache transitions from workingset thrashing")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/fuse/dev.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -783,6 +783,7 @@ static int fuse_check_page(struct page *
 	       1 << PG_uptodate |
 	       1 << PG_lru |
 	       1 << PG_active |
+	       1 << PG_workingset |
 	       1 << PG_reclaim |
 	       1 << PG_waiters))) {
 		dump_page(page, "fuse: trying to steal weird page");