swapfile/vmscan: update comments related to vmscan functions

Signed-off-by: NFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/swapfile.c

@@ -656,8 +656,8 @@ static int unuse_mm(struct mm_struct *mm,
 
 	if (!down_read_trylock(&mm->mmap_sem)) {
 		/*
-		 * Activate page so shrink_cache is unlikely to unmap its
-		 * ptes while lock is dropped, so swapoff can make progress.
+		 * Activate page so shrink_inactive_list is unlikely to unmap
+		 * its ptes while lock is dropped, so swapoff can make progress.
 		 */
 		activate_page(page);
 		unlock_page(page);

mm/vmscan.c

@@ -1979,7 +1979,7 @@ module_init(kswapd_init)
 int zone_reclaim_mode __read_mostly;
 
 #define RECLAIM_OFF 0
-#define RECLAIM_ZONE (1<<0)	/* Run shrink_cache on the zone */
+#define RECLAIM_ZONE (1<<0)	/* Run shrink_inactive_list on the zone */
 #define RECLAIM_WRITE (1<<1)	/* Writeout pages during reclaim */
 #define RECLAIM_SWAP (1<<2)	/* Swap pages out during reclaim */