linux-kernel - Re: [PATCH] lib/raid6: Add AVX2 optimized recovery functions

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Message-ID: <50B7E146.4060907@zytor.com>
Date:	Thu, 29 Nov 2012 14:27:18 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Jim Kukunas <james.t.kukunas@...ux.intel.com>,
	Linux Raid <linux-raid@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH] lib/raid6: Add AVX2 optimized recovery functions

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

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