From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] lib/raid6: Add AVX2 optimized recovery functions
Date: Thu, 29 Nov 2012 14:27:18 -0800
Message-ID: <50B7E146.4060907@zytor.com>
References: <1352411264-5156-1-git-send-email-james.t.kukunas@linux.intel.com> <m2obigf9xa.fsf@firstfloor.org> <50B7CFF8.7010401@zytor.com> <20121129211828.GZ16230@one.firstfloor.org>
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To: Andi Kleen <andi@firstfloor.org>
Cc: Jim Kukunas <james.t.kukunas@linux.intel.com>, Linux Raid <linux-raid@vger.kernel.org>, Linux Kernel <linux-kernel@vger.kernel.org>, Neil Brown <neilb@suse.de>
List-Id: linux-raid.ids

On 11/29/2012 01:18 PM, Andi Kleen wrote:
> 
> Can you quote it from the manual? As I understand volatile as usual
> is not clearly defined. 
> 
> gcc has a lot of optimization passes and volatile bugs are common.
> 

I talked it over with H.J. and we walked through the code.  The
documentation is lacking, of course, as is common with gcc.

However, that piece was pretty clear.

	-hpa