linux-kernel - Re: [RFC] kbuild: generic support for asm-generic

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Date:	Sat, 8 Jan 2011 21:53:31 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"linux-kbuild" <linux-kbuild@...r.kernel.org>,
	linux arch <linux-arch@...r.kernel.org>,
	Guan Xuetao <guanxuetao@...c.pku.edu.cn>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [RFC] kbuild: generic support for asm-generic

On Saturday 08 January 2011, Sam Ravnborg wrote:
> Hi Arnd et all.
> 
> This is my second attempt to provide generic support for
> architectures that use existing headers from asm-generic.
> 
> With this kbuild will read the file: arch/$ARCH/include/asm-generic
> 
> For each file listed in this file a wrapper is generated in
> arch/$ARCH/inclue/generated/asm/
> 
> The patch include support so headers_install works.
> 
> The inspiration came from the unicore32 patchset,
> but I redid this to make it more general.
> 
> I will follow-up with two patches.
> One that implment the functionality.
> A second that convert two headers in x86 to use the
> new asm-generic stuff (only as an example).

Very nice patch!

This is something I'd certainly like to see upstream, and you made
a good point about keeping it seperate from the unicore32 submission.

One detail I don't like too much is that you now have two different
formats for specifying lists of headers to do something with.

Instead of the new arch/*/include/asm-generic file, how about listing
all files that are actually provided by the architecture as "header-y"
in arch/*/include/asm/Kbuild, and listing all files as something
else in include/asm-generic/Kbuild and include/asm-generic/Kbuild.asm?

	Arnd
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