linux-kernel - Re: 2.6.26, PAT and AMD family 6

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Message-ID: <20080507223705.GJ18516@elf.ucw.cz>
Date:	Thu, 8 May 2008 00:37:06 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Adrian Bunk <bunk@...nel.org>,
	Rene Herman <rene.herman@...access.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>, hpa@...or.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: 2.6.26, PAT and AMD family 6

On Wed 2008-05-07 15:22:37, Yinghai Lu wrote:
> On Wed, May 7, 2008 at 3:14 PM, Pavel Machek <pavel@...e.cz> wrote:
> >  3) copy&paste code remained in the patch
> 
> i thought to keep the stub so could add more other stuff in the switch
> like 64 bit

This is _not_ good enough reason to copy&paste. Just do it like this:

>         switch (c->x86_vendor) {
>         case X86_VENDOR_AMD:
>                 early_init_amd(c);
>                 break;
>         case X86_VENDOR_INTEL:
>                 early_init_intel(c);
>                 break;
>         case X86_VENDOR_CENTAUR:
>                 early_init_centaur(c);
>                 break;
>         }

#         clear_cpu_cap(c, X86_FEATURE_PAT);
#
#         switch (c->x86_vendor) {
#         case X86_VENDOR_AMD:
#                if (c->x86 >= 0xf && c->x86 <= 0x11)
#                         set_cpu_cap(c, X86_FEATURE_PAT);
#                 break;
#         case X86_VENDOR_INTEL:
#                 if (c->x86 == 0xF || (c->x86 == 6 && c->x86_model >= 15))
#                         set_cpu_cap(c, X86_FEATURE_PAT);
#                 break;
#         }

And then, factor out code marked # into separate function, and call it
from all three places.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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