Commit 3de6047f authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Jan Kara
Browse files

highmem: Add folio_release_kmap() 



This is the folio equivalent of unmap_and_put_page(), which remains as
a wrapper for it.

Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Message-Id: <20230921200746.3303942-1-willy@infradead.org>
parent bceef326

include/linux/highmem.h

+16 −2
Original line number Diff line number Diff line
@@ -551,10 +551,24 @@ static inline void folio_zero_range(struct folio *folio, 
	zero_user_segments(&folio->page, start, start + length, 0, 0);

}



static inline void unmap_and_put_page(struct page *page, void *addr)

/**

 * folio_release_kmap - Unmap a folio and drop a refcount.

 * @folio: The folio to release.

 * @addr: The address previously returned by a call to kmap_local_folio().

 *

 * It is common, eg in directory handling to kmap a folio.  This function

 * unmaps the folio and drops the refcount that was being held to keep the

 * folio alive while we accessed it.

 */

static inline void folio_release_kmap(struct folio *folio, void *addr)

{

	kunmap_local(addr);

	put_page(page);

	folio_put(folio);

}



static inline void unmap_and_put_page(struct page *page, void *addr)

{

	folio_release_kmap(page_folio(page), addr);

}



#endif /* _LINUX_HIGHMEM_H */