linux-kernel - Re: [PATCH] ARM: supplementing IO accessors with 64 bit capability

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Message-ID: <alpine.LFD.2.11.1410231607340.6969@knanqh.ubzr>
Date:	Thu, 23 Oct 2014 16:15:19 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Catalin Marinas <catalin.marinas@....com>,
	"mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
	"stefano.stabellini@...citrix.com" <stefano.stabellini@...citrix.com>,
	"ezequiel.garcia@...e-electrons.com" 
	<ezequiel.garcia@...e-electrons.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"thomas.petazzoni@...e-electrons.com" 
	<thomas.petazzoni@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: supplementing IO accessors with 64 bit capability

On Thu, 23 Oct 2014, Russell King - ARM Linux wrote:

> On Thu, Oct 23, 2014 at 03:47:32PM -0400, Nicolas Pitre wrote:
> > On Wed, 22 Oct 2014, Catalin Marinas wrote:
> > 
> > > On Wed, Oct 22, 2014 at 05:06:23PM +0100, mathieu.poirier@...aro.org wrote:
> > > > +#if __LINUX_ARM_ARCH__ >= 5
> > > 
> > > My old ARMv5 book does not list LDRD/STRD. It looks like they only come
> > > with ARMv5TE. Are there any processors prior to this supported by the
> > > kernel?
> > 
> > We still supports ARMv4 targets.
> > 
> > As far as I know, all the ARMv5 targets we support are also TE capable.
> 
> Not quite.  We have ARM1020, which according to our proc-*.S files is
> only ARMv5T, not ARMv5TE.

Oh well.  Never saw such a beast in the field though.

Maybe to be on the very safe side, given that no ARMV5TE is likely to 
need 64-bit IO accessors at this point, this could simply be 
__LINUX_ARM_ARCH__ >= 6 instead.


Nicolas
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