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| author | Wei Yang <richard.weiyang@gmail.com> | 2025-08-17 03:26:46 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-09-13 16:55:14 -0700 |
| commit | e5e758922d1a8ce5ea97140192d395f296bcf32c (patch) | |
| tree | 3a25199b12bdff1ceadfb80e5356ad503fb92527 | |
| parent | 658fa653b4d17715c6b4c3686dabbfee6eb15e51 (diff) | |
| download | linux-e5e758922d1a8ce5ea97140192d395f296bcf32c.tar.gz linux-e5e758922d1a8ce5ea97140192d395f296bcf32c.tar.bz2 linux-e5e758922d1a8ce5ea97140192d395f296bcf32c.zip | |
mm/rmap: not necessary to mask off FOLIO_PAGES_MAPPED
At this point, we are in an if branch conditional on (nr <
ENTIRELY_MAPPED), and FOLIO_PAGES_MAPPED is equal to (ENTIRELY_MAPPED -
1). This means the upper bits are already cleared.
It is not necessary to mask it off.
Link: https://lkml.kernel.org/r/20250817032647.29147-2-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/rmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 4c00348c35fc..2f8e7ce03685 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1748,7 +1748,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio, nr_pages = folio_large_nr_pages(folio); if (level == PGTABLE_LEVEL_PMD) nr_pmdmapped = nr_pages; - nr = nr_pages - (nr & FOLIO_PAGES_MAPPED); + nr = nr_pages - nr; /* Raced ahead of another remove and an add? */ if (unlikely(nr < 0)) nr = 0; |