Re: [PATCH 4/4] memory_hotplug: use pgdat_resize_lock() when updatingnode_present_pages

[David Rientjes]

On Wed, 1 May 2013, Cody P Schafer wrote:

> Guaranteed to be stable means that if I'm a reader and pgdat_resize_lock(),
> node_present_pages had better not change at all until I pgdat_resize_unlock().
> 
> If nothing needs this guarantee, we should change the rules of
> pgdat_resize_lock(). I played it safe and went with following the existing
> rules.
> 

__offline_pages() breaks your guarantee.
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