linux-kernel - Re: [PATCH 00/18] Cross-architecture definitions of relaxed MMIO accessors

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Date:	Thu, 17 Apr 2014 16:47:15 +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>
Subject: Re: [PATCH 00/18] Cross-architecture definitions of relaxed MMIO
 accessors

Hi Sam,

On Thu, Apr 17, 2014 at 04:36:38PM +0100, Sam Ravnborg wrote:
> On Thu, Apr 17, 2014 at 02:44:03PM +0100, Will Deacon wrote:
> > Hello,
> > 
> > This RFC series attempts to define a portable (i.e. cross-architecture)
> > definition of the {readX,writeX}_relaxed MMIO accessor functions. These
> > functions are already in widespread use amongst drivers (mainly those supporting
> > devices embedded in ARM SoCs), but lack any well-defined semantics and,
> > subsequently, any portable definitions to allow these drivers to be compiled for
> > other architectures.
> 
> Could this be made in such a way that only architectures that need
> to provide their own versions actually have to add them?
> 
> The current patch-set adds the same dummy defines all over,
> and will put this burden also on new architectures.

It shouldn't be a burden for new architectures, as they will use
asm-generic/io.h and get the definitions from there.

Will
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