[RFT 00/13] iomap: Constify ioreadX() iomem argument

[Arnd Bergmann]

On Wed, Jan 8, 2020 at 10:15 AM Krzysztof Kozlowski <krzk at kernel.org> wrote:

> > The __force-cast that removes the __iomem here also means that
> > the 'volatile' keyword could be dropped from the argument list,
> > as it has no real effect any more, but then there are a few drivers
> > that mark their iomem pointers as either 'volatile void __iomem*' or
> > (worse) 'volatile void *', so we keep it in the argument list to not
> > add warnings for those drivers.
> >
> > It may be time to change these drivers to not use volatile for __iomem
> > pointers, but that seems out of scope for what Krzysztof is trying
> > to do. Ideally we would be consistent here though, either using volatile
> > all the time or never.
>
> Indeed. I guess there are no objections around const so let me send v2
> for const only.

Ok, sounds good. Maybe mention in the changelog then that the
'volatile' in the interface is intentionally left out, and that only users
of readl/writel still have it to deal with existing drivers.

    Arnd