mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator again

commit 2ff754fa8f ("mm: clear pages_scanned only if draining a pcp adds
pages to the buddy allocator again") fixed one free_pcppages_bulk()
misuse.  But two another miuse still exist.

This patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 80ef99234b89..18747528eec3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1158,8 +1158,10 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
                 to_drain = pcp->batch;
         else
                 to_drain = pcp->count;
-        free_pcppages_bulk(zone, to_drain, pcp);
-        pcp->count -= to_drain;
+        if (to_drain > 0) {
+                free_pcppages_bulk(zone, to_drain, pcp);
+                pcp->count -= to_drain;
+        }
         local_irq_restore(flags);
 }
 #endif
@@ -3915,7 +3917,8 @@ static int __zone_pcp_update(void *data)
                 pcp = &pset->pcp;
 
                 local_irq_save(flags);
-                free_pcppages_bulk(zone, pcp->count, pcp);
+                if (pcp->count > 0)
+                        free_pcppages_bulk(zone, pcp->count, pcp);
                 setup_pageset(pset, batch);
                 local_irq_restore(flags);
         }