linux-kernel - [PATCH RFC 5/6] mm/filemap: reinitialize folio->

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Date: Wed, 22 May 2024 23:03:40 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Mike Rapoport <rppt@...nel.org>,
	Minchan Kim <minchan@...nel.org>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Hyeonggon Yoo <42.hyeyoo@...il.com>
Subject: [PATCH RFC 5/6] mm/filemap: reinitialize folio->_mapcount directly

Let's get rid of the page_mapcount_reset() call and simply reinitialize
folio->_mapcount directly.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/filemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 382c3d06bfb1..c4ac7289e88a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -177,7 +177,7 @@ static void filemap_unaccount_folio(struct address_space *mapping,
 				 * and we'd rather not leak it: if we're wrong,
 				 * another bad page check should catch it later.
 				 */
-				page_mapcount_reset(&folio->page);
+				atomic_set(&folio->_mapcount, -1);
 				folio_ref_sub(folio, mapcount);
 			}
 		}
-- 
2.45.0