linux-kernel - Re: [PATCH 1/4] mmzone: make holding lock_memory_hotplug() a requirement for updating pgdat size

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Message-ID: <alpine.DEB.2.02.1305011539010.8804@chino.kir.corp.google.com>
Date:	Wed, 1 May 2013 15:39:33 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] mmzone: make holding lock_memory_hotplug() a
 requirement for updating pgdat size

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

> They are also initialized at boot without pgdat_resize_lock(), if we consider
> boot time, quite a few of the statements on when locking is required are
> wrong.
> 
> That said, you are correct that it is not strictly required to hold
> lock_memory_hotplug() when updating the fields in question because
> pgdat_resize_lock() is used.
> 

I think you've confused node size fields with zone size fields.
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