linux-kernel - Re: [PATCH] kbuild: kvm: make export of linux/kvm

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Message-ID: <20120802202911.GA9108@merkur.ravnborg.org>
Date:	Thu, 2 Aug 2012 22:29:11 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"geert@...ux-m68k.org" <geert@...ux-m68k.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] kbuild: kvm: make export of linux/kvm_para.h
	unconditional

On Thu, Aug 02, 2012 at 05:19:20PM +0300, Avi Kivity wrote:
> On 08/02/2012 03:25 PM, Will Deacon wrote:
> > On Thu, Jul 26, 2012 at 02:44:14PM +0100, Will Deacon wrote:
> >> The asm-generic version of kvm_para.h is always exported, confusing the
> >> Kbuild wildcarding that tries to detect whether the source architecture
> >> is exporting the header, since asm-* matches the generic version.
> >> 
> >> This patch unconditionally exports linux/kvm_para.h and fixes the few
> >> remaining architectures without asm/kvm_para.h to use the generic
> >> version. I also took the liberty of removing some dead lines from the
> >> wildcarding which was searcing for asm-$(SRCARCH) directores under
> >> $(srctree).
> >> 
> >> Cc: Arnd Bergmann <arnd@...db.de>
> >> Cc: Avi Kivity <avi@...hat.com>
> >> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> >> Signed-off-by: Will Deacon <will.deacon@....com>
> >> ---
> > 
> > Any further comments on this? It fixes header generation for me, so it would
> > be nice to see it merged.
> 
> Can you get it reviewed by someone who is familiar with this?  This is
> probably the third fix for the this issue.

IMO the patch is wrong.
Any use of wildcards in include/asm-generic/Kbuild.asm is wrong.

IMO include/asm-generic/Kbuild.asm is for generic header files
that ALL archs can use.

If not ALL archs can use it, then the individual arch shall
specify the file explicit.

I know we here hit a bad thing with the generic-y support,
where we miss a good way to add a file to a lot of archs
without editing a lot of files.

	Sam
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