set_page_refcounted() converts a non-refcounted page that has
(page->_refcount == 0) into a refcounted page by setting _refcount to 1,
Use page_ref_inc_return() instead to avoid unconditionally overwriting
the _refcount value.
Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
---
mm/internal.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/internal.h b/mm/internal.h
index cf3cb933eba3..cf345fac6894 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -91,9 +91,12 @@ static inline bool page_evictable(struct page *page)
*/
static inline void set_page_refcounted(struct page *page)
{
+ int refcnt;
+
VM_BUG_ON_PAGE(PageTail(page), page);
VM_BUG_ON_PAGE(page_ref_count(page), page);
- set_page_count(page, 1);
+ refcnt = page_ref_inc_return(page);
+ VM_BUG_ON_PAGE(refcnt != 1, page);
}
extern unsigned long highest_memmap_pfn;
--
2.33.0.1079.g6e70778dc9-goog
