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Date:	Mon, 5 Jan 2015 08:53:20 -0600 (CST)
From:	Christoph Lameter <>
To:	Joonsoo Kim <>
cc:	Andrew Morton <>,
	Pekka Enberg <>,
	David Rientjes <>,,,
	Jesper Dangaard Brouer <>,, Thomas Gleixner <>
Subject: Re: [PATCH 2/2] mm: don't use compound_head() in

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 <>
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