mm/vmscan: make the annotations of refaults code at the right place

After patch "mm/workingset: prepare the workingset detection
infrastructure for anon LRU", we can handle the refaults of anonymous
pages too.  So the annotations of refaults should cover both of anonymous
pages and file pages.

Link: https://lkml.kernel.org/r/20220813080757.59131-1-yang.yang29@zte.com.cn
Fixes: 170b04b ("mm/workingset: prepare the workingset detection infrastructure for anon LRU")
Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/vmscan.c

@@ -3228,6 +3228,11 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 	if (!sc->force_deactivate) {
 		unsigned long refaults;
 
+		/*
+		 * When refaults are being observed, it means a new
+		 * workingset is being established. Deactivate to get
+		 * rid of any stale active pages quickly.
+		 */
 		refaults = lruvec_page_state(target_lruvec,
 				WORKINGSET_ACTIVATE_ANON);
 		if (refaults != target_lruvec->refaults[WORKINGSET_ANON] ||
@@ -3236,11 +3241,6 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
 		else
 			sc->may_deactivate &= ~DEACTIVATE_ANON;
 
-		/*
-		 * When refaults are being observed, it means a new
-		 * workingset is being established. Deactivate to get
-		 * rid of any stale active pages quickly.
-		 */
 		refaults = lruvec_page_state(target_lruvec,
 				WORKINGSET_ACTIVATE_FILE);
 		if (refaults != target_lruvec->refaults[WORKINGSET_FILE] ||