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

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Date:	Wed, 30 Mar 2016 12:03:52 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Richard Weinberger <richard@....at>
Cc:	Rob Herring <robh@...nel.org>, Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: [PATCH 1/2] asm-generic/io.h: provide default ioremap/iounmap for !HAS_IOMEM

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