[PATCH 3/3] alloc_tag: fix page_ext_get/page_ext_put sequence during page splitting

[Suren Baghdasaryan]

pgalloc_tag_sub() might call page_ext_put() using a page different from
the one used in page_ext_get() call. This does not pose an issue since
page_ext_put() ignores this parameter as long as it's non-NULL but
technically this is wrong. Fix it by storing the original page used in
page_ext_get() and passing it to page_ext_put().

Fixes: be25d1d4e822 ("mm: create new codetag references during page splitting")
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
---
 include/linux/pgalloc_tag.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/pgalloc_tag.h b/include/linux/pgalloc_tag.h
index acb1e9ce7981..18cd0c0c73d9 100644
--- a/include/linux/pgalloc_tag.h
+++ b/include/linux/pgalloc_tag.h
@@ -71,6 +71,7 @@ static inline void pgalloc_tag_sub(struct page *page, unsigned int nr)
 static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 {
 	int i;
+	struct page_ext *first_page_ext;
 	struct page_ext *page_ext;
 	union codetag_ref *ref;
 	struct alloc_tag *tag;
@@ -78,7 +79,7 @@ static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 	if (!mem_alloc_profiling_enabled())
 		return;
 
-	page_ext = page_ext_get(page);
+	first_page_ext = page_ext = page_ext_get(page);
 	if (unlikely(!page_ext))
 		return;
 
@@ -94,7 +95,7 @@ static inline void pgalloc_tag_split(struct page *page, unsigned int nr)
 		page_ext = page_ext_next(page_ext);
 	}
 out:
-	page_ext_put(page_ext);
+	page_ext_put(first_page_ext);
 }
 
 static inline struct alloc_tag *pgalloc_tag_get(struct page *page)
-- 
2.45.2.993.g49e7a77208-goog