linux-kernel - Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured

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Message-ID: <20070211052045.GQ10050@ftp.linux.org.uk>
Date:	Sun, 11 Feb 2007 05:20:45 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Tejun Heo <htejun@...il.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Jeff Garzik <jgarzik@...ox.com>, linux-kernel@...r.kernel.org,
	linux-s390@...r.kernel.org
Subject: Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured

On Sat, Feb 10, 2007 at 05:14:13PM -0500, Tejun Heo wrote:
> Heiko Carstens wrote:
> >On Sat, Feb 10, 2007 at 12:43:16PM -0500, Tejun Heo wrote:
> \>> Heiko, how about this?  Does it fix s390?
> >
> >Unfortunately not. Now I get
> >
> >  CC      lib/iomap.o
> >lib/iomap.c: In function 'devm_ioport_map_release':
> >lib/iomap.c:270: warning: implicit declaration of function 'ioport_unmap'
> >lib/iomap.c: In function 'devm_ioport_map':
> >lib/iomap.c:297: warning: implicit declaration of function 'ioport_map'
> >lib/iomap.c:297: warning: assignment makes pointer from integer without a 
> >cast
> 
> I think an arch needs to support ioport_map/unmap and noncoherent dma 
> (just alias to coherent interface on x86/amd64) interface whether PCI is 
> implemented or not.  No?

Another source of breakage: you get devm_request_irq() only if you have
GENERIC_HARDIRQS.  Otherwise kernel/irq/ is simply not built.  Again,
you are mixing default implementation of primitives with the
implementation-agnostic stuff around those primitives.  I'd split
kernel/irq/manage.c in two files and have the places providing
alternative implementations (e.g. arch/sparc/kernel) refer to new
file in their makefiles...

I'm mostly done with that stuff, modulo noncoherent_dma breakage.  Will
send patch once the irq crap is dealt with...
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