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Date: Mon, 17 Nov 2014 15:08:21 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Zhihui Zhang <zzhsuny@gmail.com>
Cc: mgorman@suse.de, oleg@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [mempolicy] remove unnecessary is_valid_nodemask()
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On Sat, 15 Nov 2014 21:49:57 -0500 Zhihui Zhang <zzhsuny@gmail.com> wrote:

> When nodes is true, nsc->mask2 has already been filtered by nsc->mask1, which has
> already factored in node_states[N_MEMORY].
> 

Please be more specific.  Where does that filtering occur?