linux-kernel - Re: [PATCH 3/4] mmzone: note that node_size_lock should be manipulated via pgdat_resize

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Date:	Wed, 1 May 2013 15:42:43 -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 3/4] mmzone: note that node_size_lock should be manipulated
 via pgdat_resize_lock()

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

> > > Signed-off-by: Cody P Schafer <cody@...ux.vnet.ibm.com>
> > 
> > Nack, pgdat_resize_unlock() is unnecessary if irqs are known to be
> > disabled.
> > 
> 
> All this patch does is is indicate that rather than using node_size_lock
> directly (as it won't be around without CONFIG_MEMORY_HOTPLUG), one should use
> the pgdat_resize_[un]lock() helper macros.
> 

I think that's obvious given the lock is surrounded by
#ifdef CONFIG_MEMORY_HOTPLUG.  The fact remains that hotplug code need not 
use pgdat_resize_lock() if irqs are disabled.
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