Re: [PATCH 1/2] asm-generic/io.h: provide default ioremap/iounmap for !HAS_IOMEM

Arnd Bergmann
2016-03-30T10:04:08Z

On Wednesday 30 March 2016 10:13:53 Richard Weinberger wrote:
>
> I fully understand your point of view. COMPILE_TEST is a monster that
> can do the heavy lifting for you, but monsters also have claws and fangs.
>
> Having COMPILE_TEST having depend on !UML works for me. But don't
> we have other archs without io mem? At least a few years ago while
> porting nandsim to UML I found s390 that lacks of io mem too.

s390 gained IOMEM support when they started having PCI attachments.

arch/score selects NO_IOMEM, though they do in fact use MMIO, and
I'm sure their architecture has lots of other problems with build
testing that nobody cares about.

arch/tile can select NO_IOMEM when PCI is disabled, they might
care about this, though I think they also have other build-time
issues.

> Maybe we depend COMPILE_TEST on HAS_IOMEM?

That sounds fine with me as well.

Arnd