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

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Message-Id: <20080929192407.1c31fe90.krzysztof.h1@poczta.fm>
Date:	Mon, 29 Sep 2008 19:24:07 +0200
From:	Krzysztof Helt <krzysztof.h1@...zta.fm>
To:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	sfr@...b.auug.org.au
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86: enable CPUID on Cyrix cpus with CPUID disabled

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?

diff -urp linux-orig/arch/x86/kernel/cpu/cyrix.c linux-2.6.27/arch/x86/kernel/cpu/cyrix.c
--- linux-orig/arch/x86/kernel/cpu/cyrix.c	2008-09-29 00:16:31.000000000 +0200
+++ linux-2.6.27/arch/x86/kernel/cpu/cyrix.c	2008-09-29 17:03:52.563864398 +0200
@@ -428,7 +428,7 @@ static void __cpuinit cyrix_identify(str
 			local_irq_save(flags);
 			ccr3 = getCx86(CX86_CCR3);
 			setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10);       /* enable MAPEN  */
-			setCx86_old(CX86_CCR4, getCx86_old(CX86_CCR4) | 0x80);  /* enable cpuid  */
+			setCx86(CX86_CCR4, getCx86(CX86_CCR4) | 0x80);  /* enable cpuid  */
 			setCx86(CX86_CCR3, ccr3);                       /* disable MAPEN */
 			local_irq_restore(flags);
 		}

----------------------------------------------------------------------
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