On Wed, 1 May 2013, Cody P Schafer wrote:
> 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)
Why? You can't get a partial read of a word-sized data structure.
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