Date: Mon, 7 Mar 2016 11:58:04 +1100
From: Balbir Singh <bsingharora@gmail.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Michal Hocko <mhocko@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        Pavel Emelyanov <xemul@parallels.com>, linux-kernel@vger.kernel.org,
        Naoya Horiguchi <nao.horiguchi@gmail.com>
Subject: Re: [PATCH v1 02/11] mm: thp: introduce
 CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
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On Thu, Mar 03, 2016 at 04:41:49PM +0900, Naoya Horiguchi wrote:
> Introduces CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION to limit thp migration
> functionality to x86_64, which should be safer at the first step.
>

The changelog is not helpful. Could you please describe what is
architecture specific in these changes? What do other arches need to do
to port these changes over?