From dd498a8f8616c7d458a0cbb81e845d393754e7f6 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sat, 1 Dec 2018 17:52:54 +0100 Subject: backports: Add page_ref_count() and page_ref_sub_and_test() 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 --- 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 */ -- cgit v1.2.3