[04/25] mm: don't clear ->mapping in hmm_devmem_free

Commit Message

Christoph Hellwig June 17, 2019, 12:27 p.m. UTC

->mapping isn't even used by HMM users, and the field at the same offset
in the zone_device part of the union is declared as pad.  (Which btw is
rather confusing, as DAX uses ->pgmap and ->mapping from two different
sides of the union, but DAX doesn't use hmm_devmem_free).

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
Reviewed-by: John Hubbard <[e-mail]>
---
 mm/hmm.c | 2 --
 1 file changed, 2 deletions(-)

Patch

diff --git a/mm/hmm.c b/mm/hmm.c
index dc251c51803a..64e788bb1211 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1380,8 +1380,6 @@  static void hmm_devmem_free(struct page *page, void *data)
 {
 	struct hmm_devmem *devmem = data;
 
-	page->mapping = NULL;
-
 	devmem->ops->free(devmem, page);
 }