[PATCH 05/25] mm: don't clear ->mapping in hmm_devmem_free

Christoph Hellwig
2019-06-26T12:27:49Z

->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 <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
---
mm/hmm.c | 2 --
1 file changed, 2 deletions(-)

diff --git a/mm/hmm.c b/mm/hmm.c
index 376159a769fb..e7dd2ab8f9ab 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1383,8 +1383,6 @@ static void hmm_devmem_free(struct page *page, void *data)
{
struct hmm_devmem *devmem = data;

- page->mapping = NULL;
-
devmem->ops->free(devmem, page);
}

--
2.20.1