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authorCody P Schafer <cody@linux.vnet.ibm.com>2013-07-03 15:02:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:29 -0700
commitaa47228a18e6d49369df877463095b899aff495f (patch)
tree60fe5efaba2759046abb107cb25ea694505b1890 /mm/memory_hotplug.c
parent114d4b79f7e561fd76fb98eba79e18df7cdd60f0 (diff)
downloadop-kernel-dev-aa47228a18e6d49369df877463095b899aff495f.zip
op-kernel-dev-aa47228a18e6d49369df877463095b899aff495f.tar.gz
memory_hotplug: use pgdat_resize_lock() in online_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 online_pages(). 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 1ad92b4..527c510 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -918,6 +918,7 @@ static void node_states_set_node(int node, struct memory_notify *arg)
int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type)
{
+ unsigned long flags;
unsigned long onlined_pages = 0;
struct zone *zone;
int need_zonelists_rebuild = 0;
@@ -996,7 +997,11 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
zone->managed_pages += onlined_pages;
zone->present_pages += onlined_pages;
+
+ pgdat_resize_lock(zone->zone_pgdat, &flags);
zone->zone_pgdat->node_present_pages += onlined_pages;
+ pgdat_resize_unlock(zone->zone_pgdat, &flags);
+
if (onlined_pages) {
node_states_set_node(zone_to_nid(zone), &arg);
if (need_zonelists_rebuild)
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