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mm/rmap: use folio->_mapcount for small folios

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We have some cases left whereby we operate on small folios and still refer
to page->_mapcount.  Let's just use folio->_mapcount instead, which
currently still overlays page->_mapcount, so no change.

This change will make it easier to later spot any remaining users of
page->_mapcount that target tail pages.

Link: https://lkml.kernel.org/r/20240816103246.719209-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-08-16 12:32:46 +02:00 committed by Andrew Morton
parent cf54f310d0
commit d0b003ce97
2 changed files with 4 additions and 4 deletions
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4
include/linux/rmap.h
View file

@ -331,7 +331,7 @@ static __always_inline void __folio_dup_file_rmap(struct folio *folio,
switch (level) {
case RMAP_LEVEL_PTE:
if (!folio_test_large(folio)) {
atomic_inc(&page->_mapcount);
atomic_inc(&folio->_mapcount);
break;
}
@ -425,7 +425,7 @@ static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio,
if (!folio_test_large(folio)) {
if (PageAnonExclusive(page))
ClearPageAnonExclusive(page);
atomic_inc(&page->_mapcount);
atomic_inc(&folio->_mapcount);
break;
}

4
mm/rmap.c
View file

@ -1165,7 +1165,7 @@ static __always_inline unsigned int __folio_add_rmap(struct folio *folio,
switch (level) {
case RMAP_LEVEL_PTE:
if (!folio_test_large(folio)) {
nr = atomic_inc_and_test(&page->_mapcount);
nr = atomic_inc_and_test(&folio->_mapcount);
break;
}
@ -1535,7 +1535,7 @@ static __always_inline void __folio_remove_rmap(struct folio *folio,
switch (level) {
case RMAP_LEVEL_PTE:
if (!folio_test_large(folio)) {
nr = atomic_add_negative(-1, &page->_mapcount);
nr = atomic_add_negative(-1, &folio->_mapcount);
break;
}