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DateFri, 9 May 2008 08:04:25 +0200
FromHeiko Carstens <>
Subject[PATCH] memory hotplug: memmap_init_zone called twice.
Subject: [PATCH] memory hotplug: memmap_init_zone called twice.

From: Heiko Carstens <heiko.carstens@de.ibm.com>

__add_zone calls memmap_init_zone twice if memory gets attached to
an empty zone. Once via init_currently_empty_zone and once explictly
right after that call.
Looks like this is currently not a bug, however the call is
superfluous and might lead to subtle bugs if memmap_init_zone gets
changed. So make sure it is called only once.

Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
mm/memory_hotplug.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
Index: linux-2.6/mm/memory_hotplug.c
===================================================================
--- linux-2.6.orig/mm/memory_hotplug.c
+++ linux-2.6/mm/memory_hotplug.c
@@ -167,13 +167,9 @@ static int __add_zone(struct zone *zone,
int zone_type;

zone_type = zone - pgdat->node_zones;
- if (!zone->wait_table) {
- int ret = 0;
- ret = init_currently_empty_zone(zone, phys_start_pfn,
- nr_pages, MEMMAP_HOTPLUG);
- if (ret < 0)
- return ret;
- }
+ if (!zone->wait_table)
+ return init_currently_empty_zone(zone, phys_start_pfn,
+ nr_pages, MEMMAP_HOTPLUG);
memmap_init_zone(nr_pages, nid, zone_type,
phys_start_pfn, MEMMAP_HOTPLUG);
return 0;

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