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Date: Mon, 5 Jan 2015 08:53:20 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
X-X-Sender: cl@gentwo.org
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
cc: Andrew Morton <akpm@linux-foundation.org>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Jesper Dangaard Brouer <brouer@redhat.com>, rostedt@goodmis.org,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 2/2] mm: don't use compound_head() in
 virt_to_head_page()
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References: <1420421765-3209-1-git-send-email-iamjoonsoo.kim@lge.com> <1420421765-3209-2-git-send-email-iamjoonsoo.kim@lge.com>
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On Mon, 5 Jan 2015, Joonsoo Kim wrote:

> This patch implements compound_head_fast() which is similar with
> compound_head() except tail flag race handling. And then,
> virt_to_head_page() uses this optimized function to improve performance.

Yeah that is how it was before and how it should be

Acked-by: Christoph Lameter <cl@linux.com>