linux-kernel - Re: bit fields && data tearing

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Message-ID: <5409D76D.2070203@hurleysoftware.com>
Date:	Fri, 05 Sep 2014 11:31:57 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Laight <David.Laight@...LAB.COM>,
	Jakub Jelinek <jakub@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Miroslav Franc <mfranc@...hat.com>,
	Richard Henderson <rth@...ddle.net>,
	linux-alpha@...r.kernel.org
Subject: Re: bit fields && data tearing

On 09/04/2014 10:08 PM, H. Peter Anvin wrote:
> On 09/04/2014 05:59 PM, Peter Hurley wrote:
>> I have no idea how prevalent the ev56 is compared to the ev5.
>> Still we're talking about a chip that came out in 1996.
> 
> Ah yes, I stand corrected.  According to Wikipedia, the affected CPUs
> were all the 2106x CPUs (EV4, EV45, LCA4, LCA45) plus the 21164 with no
> suffix (EV5).  However, we're still talking about museum pieces here.
> 
> I wonder what the one I have in my garage is... I'm sure I could emulate
> it faster, though.

Which is a bit ironic because I remember when Digital had a team
working on emulating native x86 apps on Alpha/NT.

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