linux-kernel - Re: [patch -mm] Make check_signature() depend on CONFIG_HAS

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Message-ID: <20070628224511.GA12447@c2.user-mode-linux.org>
Date:	Thu, 28 Jun 2007 18:45:11 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch -mm] Make check_signature() depend on CONFIG_HAS_IOMEM

On Thu, Jun 28, 2007 at 11:25:37PM +0100, Alan Cox wrote:
> This completely bogus. readb() should be present on M68K, fix the
> platform to implement readb() for MMIO, even if your MMIO readb is a
> moveb instruction.
> 
> check_signature is relevant for anything with MMIO space (for example you
> can legitimately want to check_signature a MAC68K Nubus ROM).
> 
> S/390 is a bit of a special case as no S/390 usage of check_signature
> appears sane but equally it isn't used so you can stub it out.

This is a problem for UML too.

I have a patch in my tree, which basically stubs readb, waiting to see
how this is fixed for the other arches.

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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