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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-07-03 15:02:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:29 -0700
commitd702909f0aa14fe678d74d7f974aa66bfb211d0b (patch)
tree4c731abe0557a0749c38c14da77720f61544137a /mm/memory_hotplug.c
parentaa47228a18e6d49369df877463095b899aff495f (diff)
downloadlwn-d702909f0aa14fe678d74d7f974aa66bfb211d0b.tar.gz
lwn-d702909f0aa14fe678d74d7f974aa66bfb211d0b.zip
memory_hotplug: use pgdat_resize_lock() in __offline_pages()
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>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 527c51084bb8..a66d0023d219 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -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();