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mm: convert page_mapcount() to use folio_entire_mapcount()

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Remove a use of head_compound_mapcount().

Link: https://lkml.kernel.org/r/20230111142915.1001531-15-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2023-01-11 14:29:00 +00:00
committed by Andrew Morton
parent 46f2722825
commit c97eeb8f26
1 changed files with 13 additions and 9 deletions
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22
include/linux/mm.h
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@@ -853,22 +853,26 @@ static inline void page_mapcount_reset(struct page *page)
atomic_set(&(page)->_mapcount, -1); atomic_set(&(page)->_mapcount, -1);
} }
/* /**
* Mapcount of 0-order page; when compound sub-page, includes * page_mapcount() - Number of times this precise page is mapped.
* compound_mapcount of compound_head of page. * @page: The page.
* *
* Result is undefined for pages which cannot be mapped into userspace. * The number of times this page is mapped. If this page is part of
* a large folio, it includes the number of times this page is mapped
* as part of that folio.
*
* The result is undefined for pages which cannot be mapped into userspace.
* For example SLAB or special types of pages. See function page_has_type(). * For example SLAB or special types of pages. See function page_has_type().
* They use this place in struct page differently. * They use this field in struct page differently.
*/ */
static inline int page_mapcount(struct page *page) static inline int page_mapcount(struct page *page)
{ {
int mapcount = atomic_read(&page->_mapcount) + 1; int mapcount = atomic_read(&page->_mapcount) + 1;
if (likely(!PageCompound(page))) if (unlikely(PageCompound(page)))
return mapcount; mapcount += folio_entire_mapcount(page_folio(page));
page = compound_head(page);
return head_compound_mapcount(page) + mapcount; return mapcount;
} }
int folio_total_mapcount(struct folio *folio); int folio_total_mapcount(struct folio *folio);