linux-kernel - Re: [PATCH 2/2] x86: Move PCI IO ECS code to x86/pci

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Message-ID: <20080613181627.GH10019@erda.amd.com>
Date:	Fri, 13 Jun 2008 20:16:27 +0200
From:	Robert Richter <robert.richter@....com>
To:	Glauber Costa <glommer@...il.com>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 2/2] x86: Move PCI IO ECS code to x86/pci

On 13.06.08 14:02:46, Glauber Costa wrote:
> > diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
> > index 5c2799c..15f505d 100644
> > --- a/arch/x86/pci/amd_bus.c
> > +++ b/arch/x86/pci/amd_bus.c
> > @@ -1,5 +1,9 @@
> >  #include <linux/init.h>
> >  #include <linux/pci.h>
> > +#include "pci.h"
> > +
> > +#ifdef CONFIG_X86_64
> 
> Please, don't do that. We are in an ongoing effort to cleanup the
> remaining ifdefs in x86 code, and adding more of them would just make
> it harder.
> If you really need it, move the common part to a separate file (avoid
> the _32 and _64 naming), and have it compiled conditionally on your
> architecture.

Ok, so what about shared code? Keep all this in separate files:
amd_bus.c, (amd_bus_32.c), amd_bus_64.c, (amd_bus.h)?

Is the strategy to avoid #ifdefs and instead use the flags in
Makefiles? My intention was to coalesce the files. Maybe I was wrong
here.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com

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