This was introduced in kernel commit fe896d18789 ("mm: introduce page
reference manipulation functions") and will be used by
__page_frag_cache_drain() in the next commit.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/page_ref.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/backport/backport-include/linux/page_ref.h b/backport/backport-include/linux/page_ref.h
index 55fc14f5..e45734ec 100644
--- a/backport/backport-include/linux/page_ref.h
+++ b/backport/backport-include/linux/page_ref.h
@@ -8,6 +8,16 @@ static inline void page_ref_inc(struct page *page)
{
atomic_inc(&page->_count);
}
+
+static inline int page_ref_count(struct page *page)
+{
+ return atomic_read(&page->_count);
+}
+
+static inline int page_ref_sub_and_test(struct page *page, int nr)
+{
+ return atomic_sub_and_test(nr, &page->_count);
+}
#endif
#endif /* __BP_PAGE_REF_H */
--
2.11.0
--
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