linux-kernel - Re: x86 merge: Keep kernel/cpu for CPU specific code?

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Message-ID: <4739E612.7030601@zytor.com>
Date:	Tue, 13 Nov 2007 09:59:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Robert Richter <robert.richter@....com>
CC:	Adrian Bunk <bunk@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: x86 merge: Keep kernel/cpu for CPU specific code?

Robert Richter wrote:
> On 13.11.07 13:02:08, Adrian Bunk wrote:
>> On Tue, Nov 13, 2007 at 12:44:43PM +0100, Robert Richter wrote:
>>> x86 CPU specific code is currently implemented in different ways for
>>> 64 and 32 bit. While there are almost no CPU specific files for 64
>>> bit, there is the arch/x86/kernel/cpu/ directory for 32 bit. Is there
>>> already an idea about whether to use kernel/cpu also for 64 bit?
>> It is also used for 64bit for years.
> 
> Yes, but almost all files in arch/x86/kernel/cpu/ depend on
> CONFIG_X86_32.
> 
> Here is an example for similiar implementations:
> 
> arch/x86/kernel/cpu/amd.c:static void __cpuinit init_amd(struct cpuinfo_x86 *c)
> arch/x86/kernel/setup_64.c:static void __cpuinit init_amd(struct cpuinfo_x86 *c)
> 
> The question is, will there be a CPU specific file such as amd.c?
> 

That's my current intent, as I consider the 32-bit code cleaner even 
though Andi disagrees.  That doesn't mean it's good enough as-is, of 
course, but I would like to maintain things reasonably well separated out.

	-hpa

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