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>
---
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
