linux-kernel - Re: [PATCH] x86: enable CPUID on Cyrix cpus with CPUID disabled

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Date:	Tue, 30 Sep 2008 11:43:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Krzysztof Helt <krzysztof.h1@...zta.fm>
Cc:	linux-kernel@...r.kernel.org, sfr@...b.auug.org.au,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Samuel Sieb <samuel@...b.net>
Subject: Re: [PATCH] x86: enable CPUID on Cyrix cpus with CPUID disabled


* Krzysztof Helt <krzysztof.h1@...zta.fm> wrote:

> From: Krzysztof Helt <krzysztof.h1@...pl>
> 
> The macros setCx86_old() and getCx86_old() do not
> work as a comment says in the processor-cyrix.h.
> 
> Use working inline functions instead to enable
> the CPUID instriction on Cyrix cpus. 
> 
> Tested on IBM 6x86MX cpu with disabled the
> CPUID instruction.
> 
> Signed-off-by: Krzysztof Helt <krzysztof.h1@...pl>
> ---
> 
> This patch is against the linux-next tree (20080819)
> as it contains the following patch:
> 
> x86, cyrix: debug
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git;a=commit;h=026e2c05ef58ef413e2d52696f125d5ea1aa8bce
> 
> The linux-2.6-tip tree has not the Ingo's patch so it 
> does not require my patch.
> 
> I am confused. Is the x86 detection code for Cyrix
> cpus is right in the linux-next or in the linux-2.6-tip?
> Should I prepare patches against the linux-2.6-tip
> or linux-next?

now that the bug is correctly understood and fixed, could you please 
send a patch that cleans it all up and gets rid of the setCx86_old() / 
setCx86() API distinction? I.e. revert commit 026e2c0 ("x86, cyrix: 
debug"). Against tip/master please.

note that this was all done in connection to:

 commit c6744955d0ec0cb485c28c51eeb7185e260f6172
 Author: Samuel Sieb <samuel@...b.net>
 Date:   Wed Aug 6 22:06:29 2008 -0700

    x86: fix "kernel won't boot on a Cyrix MediaGXm (Geode)"

	Ingo
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