linux-kernel - Re: [PATCH v3 3/4] memory_hotplug: use pgdat_resize_lock() in online

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Message-ID: <alpine.DEB.2.02.1305161404470.1348@chino.kir.corp.google.com>
Date:	Thu, 16 May 2013 14:05:06 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/4] memory_hotplug: use pgdat_resize_lock() in
 online_pages()

On Wed, 15 May 2013, Andrew Morton wrote:

> On Mon, 13 May 2013 16:13:06 -0700 Cody P Schafer <cody@...ux.vnet.ibm.com> wrote:
> 
> > 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.  [...]
> 
> Yeah, I suppose so.  Although no present code sites actually do that.
> 

Agreed, I see no purpose in patches 2-4 in this series as mentioned in v2.
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