linux-kernel - Re: [PATCH v2 16/18] x86: io: implement dummy relaxed accessor macros for writes

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Message-ID: <537F60E0.1060307@zytor.com>
Date:	Fri, 23 May 2014 07:53:20 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Will Deacon <will.deacon@....com>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"monstr@...str.eu" <monstr@...str.eu>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	"broonie@...aro.org" <broonie@...aro.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v2 16/18] x86: io: implement dummy relaxed accessor macros
 for writes

On 05/23/2014 07:46 AM, Will Deacon wrote:
> 
> I would like the relaxed accessors to be ordered with respect to each other...
> 
> What do you think?
> 

I think "I would like" isn't a very good motivation.  What are the
semantics of these things supposed to be?  It seems more than a bit odd
to require them to be ordered with respect to each other and everything
else (which is what a memory clobber does) and then call them "relaxed".

	-hpa


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