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

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Message-ID: <14780144.KRcmhp8YbE@wuerfel>
Date:	Thu, 25 Sep 2014 12:43:41 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Will Deacon <will.deacon@....com>
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Subject: Re: [PATCH v3 01/17] asm-generic: io: implement relaxed accessor macros as conditional wrappers

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.

	Arnd
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