diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h
index 8ca8283..d2a9b4f 100644
--- a/arch/x86/include/asm/page.h
+++ b/arch/x86/include/asm/page.h
@@ -55,10 +55,15 @@ static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
  * virt_to_page(kaddr) returns a valid pointer if and only if
  * virt_addr_valid(kaddr) returns true.
  */
-#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 extern bool __virt_addr_valid(unsigned long kaddr);
 #define virt_addr_valid(kaddr)	__virt_addr_valid((unsigned long) (kaddr))
+#define virt_to_page(kaddr)	\
+	({ \
+		const void *__kaddr = (const void *)(kaddr); \
+		BUG_ON(!virt_addr_valid(__kaddr)); \
+		pfn_to_page(__pa(__kaddr) >> PAGE_SHIFT); \
+	})
 
 #endif	/* __ASSEMBLY__ */