linux-kernel - Re: [PATCH] arch/arm/Kconfig: Make UIO available on ARM architecture

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Date:	Fri, 08 Feb 2008 10:18:31 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Marcin Juszkiewicz <openembedded@...rwu.biz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <greg@...ah.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch/arm/Kconfig: Make UIO available on ARM
	architecture


On Fri, 2008-02-08 at 09:45 +0000, Russell King - ARM Linux wrote:
> If we are serious about allowing ARM to use drivers/Kconfig, then let's
> not get distracted by perfection - by trying to do too many changes in
> one go.
> 
> If, today, we conditionalise MTD or IDE on a certain set of symbols,
> then those conditions should be preserved in the first step - it should
> be a 1:1 translation.

That makes some sense. Currently you have:

	if ALIGNMENT_TRAP || !CPU_CP15_MMU
	source "drivers/mtd/Kconfig"
	endif

> Later, if there's a need to improve it (as you're suggesting) that should
> be a *separate* change.

We can certainly improve the behaviour later, it's true -- it's not the
end of the world if we continue to have the whole of the MTD layer
turned off on platforms with alignment problems for now.

But still, it's HAVE_UNALIGNED_ACCESS which we want to depend on, not a
newly-invented HAVE_MTD. And there are other places we really ought to
be depending on HAVE_UNALIGNED_ACCESS too.

-- 
dwmw2

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