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mm/rmap: not necessary to mask off FOLIO_PAGES_MAPPED

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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>
This commit is contained in:
Wei Yang 2025-08-17 03:26:46 +00:00 • committed by Andrew Morton
parent 658fa653b4
commit e5e758922d
1 changed files with 1 additions and 1 deletions
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2
mm/rmap.c
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@ -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;