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: Kundan Kumar <kundan.kumar@xxxxxxxxxxx> Tested-by: Luis Chamberlain <mcgrof@xxxxxxxxxx> Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> --- include/linux/mm.h | 1 + mm/gup.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 6549d0979b28..3de55d295cb9 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -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) diff --git a/mm/gup.c b/mm/gup.c index 54d0dc3831fb..02c46ae33028 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -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. -- 2.25.1