linux-kernel - Re: [PATCH 1/3] lib: add NO_GENERIC_PCI_IOPORT

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Date:	Tue, 31 Jan 2012 15:59:25 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Kevin Cernekee <cernekee@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Myron Stowe <myron.stowe@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	James Morris <jmorris@...ei.org>,
	"John W. Linville" <linville@...driver.com>,
	Michael Witten <mfwitten@...il.com>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/3] lib: add NO_GENERIC_PCI_IOPORT_MAP

On Tuesday 31 January 2012, Michael S. Tsirkin wrote:
> I have an idea: we can make the generic one inline
> if we keep it in the .c file. So something like
> the below on top of my patch will probably work.
> Ack?

IMHO this is still worse than the macro, because it breaks common practice.
The common way to do this is #ifdef/#else/#endif in the header file to
provide either an extern or a macro/inline definition, while having the
inline definition in a separate place makes it harder to understand
what's going on. E.g. a frequent review comment is to not put extern
declarations inside of #ifdef, but if someone tries that here, it would
break.

You also still need the #ifdef in the implementation file, which we
try to avoid normally just like we try to avoid macros where possible.

	Arnd
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