linux-kernel - Re: [PATCH v2 14/18] sparc: io: implement dummy relaxed accessor macros for writes

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Message-ID: <20140523143810.GE21319@arm.com>
Date:	Fri, 23 May 2014 15:38:10 +0100
From:	Will Deacon <will.deacon@....com>
To:	Sam Ravnborg <sam@...nborg.org>
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>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 14/18] sparc: io: implement dummy relaxed accessor
 macros for writes

On Thu, May 22, 2014 at 07:18:38PM +0100, Sam Ravnborg wrote:
> On Thu, May 22, 2014 at 05:47:26PM +0100, Will Deacon wrote:
> > write{b,w,l,q}_relaxed are implemented by some architectures in order to
> > permit memory-mapped I/O accesses with weaker barrier semantics than the
> > non-relaxed variants.
> > 
> > This patch adds dummy macros for the write accessors to sparc, in the
> > same vein as the dummy definitions for the relaxed read accessors. The
> > existing relaxed read{b,w,l} accessors are moved into asm/io.h, since
> > they are identical between 32-bit and 64-bit machines.
> > 
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Signed-off-by: Will Deacon <will.deacon@....com>
> Look good:
> Acked-by: Sam Ravnborg <sam@...nborg.org>

Thanks, Sam.

> But you should wait for David's ack too.

Yeah, I still need to get buy-in on the semantics from the PPC folks
anyway.

Will
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