linux-kernel - Re: [PATCH 4/4] [RFC] ARM: treewide: manually change more mach-*/*.h includes

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Message-ID: <20120822214323.GA12255@n2100.arm.linux.org.uk>
Date:	Wed, 22 Aug 2012 22:43:23 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] [RFC] ARM: treewide: manually change more
	mach-*/*.h includes

On Wed, Aug 22, 2012 at 01:01:19PM +0000, Arnd Bergmann wrote:
> These are lots of device drivers that include machine
> specific header files from ARM platforms and that are
> not easily scriptable. The changes have been found through
> manual inspection and should cause no visible changes
> because of the build script that maps the old names to the
> new ones.

And you end up missing a bunch of drivers in the process, such as the
sa1100 RTC driver which is shared between sa11x0 and PXA.  I wonder
how many of the Samsung platforms get broken by this as well...

In any case, what we _should_ be doing here as well is moving the headers
included by drivers for platform data out of the arch/arm/mach/ subtrees
and into include/linux/platform_data.  That will substantially reduce the
amount of mach/ headers to deal with.

Where I want this to get to is not a persistence of the existing crappy
situation where platforms stuff platform data definitions into arch/arm,
but instead put them in the right place.  That means providing them with
a good reason why the existing solution won't work, and not allowing
mach/ includes in drivers is a very good way to achieve that.
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