mm: move lru_to_page to mm_inline.h

Move lru_to_page() from internal.h to mm_inline.h.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Acked-by: NVlastimil Babka <vbabka@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/linux/mm_inline.h

@@ -100,4 +100,6 @@ static __always_inline enum lru_list page_lru(struct page *page)
 	return lru;
 }
 
+#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))
+
 #endif

mm/internal.h

@@ -119,8 +119,6 @@ extern int isolate_lru_page(struct page *page);
 extern void putback_lru_page(struct page *page);
 extern bool zone_reclaimable(struct zone *zone);
 
-#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
-
 /*
  * in mm/rmap.c:
  */

mm/readahead.c

@@ -17,6 +17,7 @@
 #include <linux/pagemap.h>
 #include <linux/syscalls.h>
 #include <linux/file.h>
+#include <linux/mm_inline.h>
 
 #include "internal.h"