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memory_hotplug: use pgdat_resize_lock() in __offline_pages()

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mmzone.h documents node_size_lock (which pgdat_resize_lock() locks) as
follows:

        * Must be held any time you expect node_start_pfn, node_present_pages
        * or node_spanned_pages stay constant.  [...]

So actually hold it when we update node_present_pages in __offline_pages().

[akpm@linux-foundation.org: fix build]
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cody P Schafer 2013-07-03 15:02:11 -07:00 committed by Linus Torvalds
parent aa47228a18
commit d702909f0a
1 changed files with 5 additions and 0 deletions
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5
mm/memory_hotplug.c
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@ -1492,6 +1492,7 @@ static int __ref __offline_pages(unsigned long start_pfn,
unsigned long pfn, nr_pages, expire;
long offlined_pages;
int ret, drain, retry_max, node;
unsigned long flags;
struct zone *zone;
struct memory_notify arg;
@ -1585,7 +1586,11 @@ repeat:
/* removal success */
zone->managed_pages -= offlined_pages;
zone->present_pages -= offlined_pages;
pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages -= offlined_pages;
pgdat_resize_unlock(zone->zone_pgdat, &flags);
totalram_pages -= offlined_pages;
init_per_zone_wmark_min();