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Subject[PATCH v2 4/4] memory_hotplug: use pgdat_resize_lock() in __offline_pages()
Date
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 | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0bdca10..b59a695 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1582,7 +1582,11 @@ 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();
--
1.8.2.2


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