remove set_page_buffers() and clear_page_buffers()

@@ -117,16 +117,6 @@ BUFFER_FNS(Boundary, boundary)
 		((struct buffer_head *)(page)->private);	\
 	})
 #define page_has_buffers(page)	PagePrivate(page)
-#define set_page_buffers(page, buffers)				\
-	do {							\
-		SetPagePrivate(page);				\
-		page->private = (unsigned long)buffers;		\
-	} while (0)
-#define clear_page_buffers(page)				\
-	do {							\
-		ClearPagePrivate(page);				\
-		page->private = 0;				\
-	} while (0)
 
 #define invalidate_buffers(dev)	__invalidate_buffers((dev), 0)
 #define destroy_buffers(dev)	__invalidate_buffers((dev), 1)

@@ -152,14 +152,16 @@ __set_page_buffers(struct page *page, st
 {
 	if (page_has_buffers(page))
 		buffer_error();
-	set_page_buffers(page, head);
 	page_cache_get(page);
+	SetPagePrivate(page);
+	page->private = (unsigned long)head;
 }
 
 static inline void
 __clear_page_buffers(struct page *page)
 {
-	clear_page_buffers(page);
+	ClearPagePrivate(page);
+	page->private = 0;
 	page_cache_release(page);
 }