diff --git a/include/linux/mm.h b/include/linux/mm.h
index 1dd588b7c64930d9cce02d370bd45029218c1a6a..f0f3905f8bb8c92c6dc50cf3a87687b1eb978a5e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2532,12 +2532,10 @@ extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
 #ifdef CONFIG_PAGE_POISONING
 extern bool page_poisoning_enabled(void);
 extern void kernel_poison_pages(struct page *page, int numpages, int enable);
-extern bool page_is_poisoned(struct page *page);
 #else
 static inline bool page_poisoning_enabled(void) { return false; }
 static inline void kernel_poison_pages(struct page *page, int numpages,
 					int enable) { }
-static inline bool page_is_poisoned(struct page *page) { return false; }
 #endif
 
 #ifdef CONFIG_DEBUG_PAGEALLOC