Commit d3bfbfb1 authored by Kundan Kumar's avatar Kundan Kumar Committed by Jens Axboe
Browse files

mm: release number of pages of a folio 



Add a new function unpin_user_folio() to put the refs of a folio by
npages count.

The check for BIO_PAGE_PINNED flag is removed as it is already checked
in bio_release_pages().

Signed-off-by: default avatarKundan Kumar <kundan.kumar@samsung.com>
Tested-by: default avatarLuis Chamberlain <mcgrof@kernel.org>
Reviewed-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240911064935.5630-4-kundan.kumar@samsung.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent ed9832bc

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -1597,6 +1597,7 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages, 
void unpin_user_page_range_dirty_lock(struct page *page, unsigned long npages,

				      bool make_dirty);

void unpin_user_pages(struct page **pages, unsigned long npages);

void unpin_user_folio(struct folio *folio, unsigned long npages);

void unpin_folios(struct folio **folios, unsigned long nfolios);



static inline bool is_cow_mapping(vm_flags_t flags)

mm/gup.c

+13 −0
Original line number Diff line number Diff line
@@ -415,6 +415,19 @@ void unpin_user_pages(struct page **pages, unsigned long npages) 
}

EXPORT_SYMBOL(unpin_user_pages);



/**

 * unpin_user_folio() - release pages of a folio

 * @folio:  pointer to folio to be released

 * @npages: number of pages of same folio

 *

 * Release npages of the folio

 */

void unpin_user_folio(struct folio *folio, unsigned long npages)

{

	gup_put_folio(folio, npages, FOLL_PIN);

}

EXPORT_SYMBOL(unpin_user_folio);



/**

 * unpin_folios() - release an array of gup-pinned folios.

 * @folios:  array of folios to be marked dirty and released.