From 9687c44fccd295d68889ac2111f6e59ba55d5350 Mon Sep 17 00:00:00 2001 From: Cody P Schafer Date: Wed, 19 Jun 2013 10:06:04 +1000 Subject: [PATCH] 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 Cc: David Rientjes Signed-off-by: Andrew Morton --- mm/memory_hotplug.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 081b4d654ed6..a870d8071a3c 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) -- 2.39.5