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

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Date:	Tue, 09 Sep 2014 07:18:22 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	"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 09/08/2014 03:17 PM, One Thousand Gnomes wrote:
>>> I think the whole "removing Alpha EV5" support is basically bonkers. Just
>>> use set_bit in the tty layer. Alpha will continue to work as well as it
>>> always has done and you won't design out support for any future processor
>>> that turns out not to do byte aligned stores.
>>>
>>> Alan
>>>
>>
>> Is *that* what we are talking about?  I was added to this conversation
>> in the middle where it had already generalized, so I had no idea.
>>
>> 	-hpa
> 
> Yes there are some flags in the tty layer that are vulnerable to this
> (although they've been vulnerable to it and missing a lock since last
> century with no known ill effects).

That observation cuts both ways; I'm willing to leave it vulnerable with
'no known ill effects' on the Alpha.
 

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