linux-kernel - Re: [PATCH v3 01/17] asm-generic: io: implement relaxed accessor macros as conditional wrappers

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Message-ID: <20140925114417.GJ20043@arm.com>
Date:	Thu, 25 Sep 2014 12:44:17 +0100
From:	Will Deacon <will.deacon@....com>
To:	Arnd Bergmann <arnd@...db.de>
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Subject: Re: [PATCH v3 01/17] asm-generic: io: implement relaxed accessor
 macros as conditional wrappers

On Thu, Sep 25, 2014 at 11:43:41AM +0100, Arnd Bergmann wrote:
> On Thursday 25 September 2014 11:38:46 Will Deacon wrote:
> > On Thu, Sep 25, 2014 at 11:32:00AM +0100, Arnd Bergmann wrote:
> > > On Wednesday 24 September 2014 18:17:20 Will Deacon wrote:
> > > > {read,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 wrappers to asm-generic so that drivers can rely on the
> > > > relaxed accessors being available, even if they don't always provide
> > > > weaker ordering guarantees. Since some architectures both include
> > > > asm-generic/io.h and define some relaxed accessors, the definitions here
> > > > are conditional for the time being.
> > > > 
> > > > Cc: Arnd Bergmann <arnd@...db.de>
> > > > Signed-off-by: Will Deacon <will.deacon@....com>
> > > > ---
> > > >  include/asm-generic/io.h | 26 ++++++++++++++++++++++++++
> > > >  1 file changed, 26 insertions(+)
> > > > 
> > > 
> > > Acked-by: Arnd Bergmann <arnd@...db.de>
> > 
> > Thanks, Arnd. Do you have other patches queued for asm-generic, or shall I
> > take this patch (on its own) via the arm64 tree?
> 
> I don't have other patches queued up yet, but Thierry has another patch
> for asm-generic/io.h that I want to merge, so this time I'd prefer to
> take it through my tree in case there are conflicts.

Ok, suits me. I'll drop this from my series when it hits mainline.

Will
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