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mm: Add folio_mapcount()

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This implements the same algorithm as total_mapcount(), which is
transformed into a wrapper function.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-17 16:33:26 -05:00
parent 74e8ee4708
commit 4ba1119cd5
3 changed files with 40 additions and 25 deletions
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8
include/linux/mm.h
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@ -825,8 +825,14 @@ static inline int page_mapcount(struct page *page)
return atomic_read(&page->_mapcount) + 1;
}
int folio_mapcount(struct folio *folio);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int total_mapcount(struct page *page);
static inline int total_mapcount(struct page *page)
{
return folio_mapcount(page_folio(page));
}
int page_trans_huge_mapcount(struct page *page);
#else
static inline int total_mapcount(struct page *page)