Messages in this thread Patch in this message | | | From | Cody P Schafer <> | Subject | [PATCH 4/4] memory_hotplug: use pgdat_resize_lock() when updating node_present_pages | Date | Wed, 1 May 2013 15:17:15 -0700 |
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mmzone.h documents node_size_lock (which pgdat_resize_lock() locks) as guarding against changes to node_present_pages, so actually lock it when we update node_present_pages to keep that promise.
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> --- mm/memory_hotplug.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a221fac..0bdca10 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -915,6 +915,7 @@ 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; @@ -993,7 +994,11 @@ 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) -- 1.8.2.2
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