Add a new function unpin_user_folio() to put the refs of a folio by
npages count.
Signed-off-by: Kundan Kumar <kundan.kumar@xxxxxxxxxxx>
---
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 eb7c96d24ac0..fcf9b6263326 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1623,6 +1623,7 @@ 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);
static inline bool is_cow_mapping(vm_flags_t flags)
{
diff --git a/mm/gup.c b/mm/gup.c
index ca0f5cedce9b..bc96efa43d1b 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -488,6 +488,19 @@ 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);
+
/*
* Set the MMF_HAS_PINNED if not set yet; after set it'll be there for the mm's
* lifecycle. Avoid setting the bit unless necessary, or it might cause write
--
2.25.1
