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

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Message-ID: <Pine.LNX.4.64.0706290048290.1817@scrub.home>
Date:	Fri, 29 Jun 2007 00:51:31 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
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>
Subject: Re: [patch -mm] Make check_signature() depend on CONFIG_HAS_IOMEM

Hi,

On Thu, 28 Jun 2007, Alan Cox wrote:

> > check_signature() needs readb() but with some setups (s390, m68k allmodconfig)
> > there is no implementation of readb.  This causes build errors with
> > -Werror-implicit-function-declaration.
> 
> 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).

A generic check_signature() is a little difficult if we have separate io 
functions for every bus.

bye, Roman
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