mm: move definition for LRU isolation modes to a header

Currently, vmscan.c defines the isolation modes for __isolate_lru_page().
Memory compaction needs access to these modes for isolating pages for
migration.  This patch exports them.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 600b03b7732e4634946929a3a21f75991df6538d..1e8ce148d0585f75b243754909dcbd83d3875ac9 100644 (file)
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -229,6 +229,11 @@ static inline void lru_cache_add_file(struct page *page)
        __lru_cache_add(page, LRU_INACTIVE_FILE);
 }
 
+/* LRU Isolation modes. */
+#define ISOLATE_INACTIVE 0     /* Isolate inactive pages. */
+#define ISOLATE_ACTIVE 1       /* Isolate active pages. */
+#define ISOLATE_BOTH 2         /* Isolate both active and inactive pages. */
+
 /* linux/mm/vmscan.c */
 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
                                        gfp_t gfp_mask, nodemask_t *mask);

diff --git a/mm/vmscan.c b/mm/vmscan.c
index f2c367c9ec1272886e5fe978224632094a480f98..25b0202c60df66234ccb103ed1cb285c6badf105 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -839,11 +839,6 @@ keep:
        return nr_reclaimed;
 }
 
-/* LRU Isolation modes. */
-#define ISOLATE_INACTIVE 0     /* Isolate inactive pages. */
-#define ISOLATE_ACTIVE 1       /* Isolate active pages. */
-#define ISOLATE_BOTH 2         /* Isolate both active and inactive pages. */
-
 /*
  * Attempt to remove the specified page from its LRU.  Only take this page
  * if it is of the appropriate PageActive status.  Pages which are being