Re: [PATCH 2/2] asm-generic: io: don't perform swab during {in,out} string functions

Will Deacon
2012-04-27T17:00:09Z

On Fri, Apr 27, 2012 at 05:18:58PM +0100, Mike Frysinger wrote:
> On Friday 27 April 2012 06:42:56 Will Deacon wrote:
> > The {in,out}s{b,w,l} functions are designed to operate on a stream of
> > bytes and therefore should not perform any byte-swapping, regardless of
> > the CPU byte order.
>
> says who ? where's the agreed upon documentation for this ?

This specific case is actually documented in Linux Device Drivers, but I
appreciate that it's not especially clear. I had some offline discussion
with Arnd where we agreed on this -- it also means that asm-generic/io.h
matches what is done by bi-endian architectures providing their own
accessors.

Will