From: Yasunori Goto <y-goto@jp.fujitsu.com>
Date: Fri, 1 Jun 2007 07:46:53 +0000 (-0700)
Subject: memory hotplug: fix unnecessary calling of init_currenty_empty_zone()
X-Git-Tag: firefly_0821_release~28809
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=13466c8419c3ab3ccd5e905eef53ca49c6c201be;p=firefly-linux-kernel-4.4.55.git

memory hotplug: fix unnecessary calling of init_currenty_empty_zone()

zone->present_pages is updated in online_pages().  But, __add_zone() can be
called twice or more before calling online_pages().  So,
init_currenty_empty_zone() can be called unnecessary times.  It is cause of
memory leak of zone's wait_table.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 84279127fcd3..df9d554bea30 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -65,7 +65,7 @@ static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
 	int zone_type;
 
 	zone_type = zone - pgdat->node_zones;
-	if (!populated_zone(zone)) {
+	if (!zone->wait_table) {
 		int ret = 0;
 		ret = init_currently_empty_zone(zone, phys_start_pfn,
 						nr_pages, MEMMAP_HOTPLUG);