From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu, 1 May 2008 18:37:23 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
Subject: Re: Warning on memory offline (and possible in usual migration?)
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To: Nick Piggin <npiggin@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, GOTO <y-goto@jp.fujitsu.com>
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On Fri, 2 May 2008, Nick Piggin wrote:

> The buffer migration path protects against read IO on buffers.

Digging.... Ok the buffers are locked which means that they cannot be 
under I/O because I/O locks the buffers

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