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authorKundan Kumar <kundan.kumar@samsung.com>2024-09-11 12:19:34 +0530
committerJens Axboe <axboe@kernel.dk>2024-09-11 07:24:01 -0600
commitd3bfbfb1248498656cd25c51e41c1e31219bd0dd (patch)
tree77b5c25b9a8f912a652b81863e5bfa359823da07
parented9832bc08db29874600eb066b74918fe6fc2060 (diff)
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: Kundan Kumar <kundan.kumar@samsung.com> Tested-by: Luis Chamberlain <mcgrof@kernel.org> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://lore.kernel.org/r/20240911064935.5630-4-kundan.kumar@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--include/linux/mm.h1
-rw-r--r--mm/gup.c13
2 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index c4b238a20b76..2fd88cd5997d 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
@@ -416,6 +416,19 @@ 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.
* @nfolios: number of folios in the @folios array.