Re: [PATCH v5 2/6] arch: unify ioremap prototypes and macro aliases

[Christoph Hellwig]

On Wed, Jul 01, 2015 at 08:55:57AM +0200, Geert Uytterhoeven wrote:
> >
> > I think doing this at runtime might be a better idea.  E.g. a
> > ioremap_flags with the CACHED argument will return -EOPNOTSUP unless
> > actually implemented.  On various architectures different CPUs or
> > boards will have different capabilities in this area.
> 
> So it would be the responsibility of the caller to fall back from
> ioremap(..., CACHED) to ioremap(..., UNCACHED)?
> I.e. all drivers using it should be changed...

All of the zero users we currently have will need to be changed, yes.

Note that I propose to leave ioremap(), aka ioremap_flags(..., 0) as
a default that always has to work, -EOPNOTSUP is only a valid return
value for non-default flaga.
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