Commit c97eeb8f authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Andrew Morton
Browse files

mm: convert page_mapcount() to use folio_entire_mapcount() 

Remove a use of head_compound_mapcount().

Link: https://lkml.kernel.org/r/20230111142915.1001531-15-willy@infradead.org


Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 46f27228

include/linux/mm.h

+13 −9
Original line number Diff line number Diff line
@@ -853,22 +853,26 @@ static inline void page_mapcount_reset(struct page *page) 
	atomic_set(&(page)->_mapcount, -1);

}



/*

 * Mapcount of 0-order page; when compound sub-page, includes

 * compound_mapcount of compound_head of page.

/**

 * page_mapcount() - Number of times this precise page is mapped.

 * @page: The page.

 *

 * 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.

 *

 * Result is undefined for pages which cannot be mapped into userspace.

 * 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().

 * They use this place in struct page differently.

 * They use this field in struct page differently.

 */

static inline int page_mapcount(struct page *page)

{

	int mapcount = atomic_read(&page->_mapcount) + 1;



	if (likely(!PageCompound(page)))

	if (unlikely(PageCompound(page)))

		mapcount += folio_entire_mapcount(page_folio(page));



	return mapcount;

	page = compound_head(page);

	return head_compound_mapcount(page) + mapcount;

}



int folio_total_mapcount(struct folio *folio);