linux-kernel - [PATCH v2]x86: Fix override new_cpu

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Message-ID: <20130628144516.GA2177@udknight>
Date:	Fri, 28 Jun 2013 22:45:16 +0800
From:	Wang YanQing <udknight@...il.com>
To:	bp@...en8.de
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, bp@...e.de, fenghua.yu@...el.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2]x86: Fix override new_cpu_data.x86 with 486

We should set X86 to 486 before use cpuid
to detect the cpu type, if we set X86 to 486
after cpuid, then we will get 486 until
cpu_detect runs.

Signed-off-by: Wang YanQing <udknight@...il.com>
---
ChangeLog
v1-v2:
1:Use more accurate and short commit log

 arch/x86/kernel/head_32.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 73afd11..24c6675 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -410,6 +410,7 @@ enable_paging:
 /*
  * Check if it is 486
  */
+	movb $4,X86			# at least 486
 	cmpl $-1,X86_CPUID
 	je is486
 
@@ -437,7 +438,6 @@ enable_paging:
 	movl %edx,X86_CAPABILITY
 
 is486:
-	movb $4,X86
 	movl $0x50022,%ecx	# set AM, WP, NE and MP
 	movl %cr0,%eax
 	andl $0x80000011,%eax	# Save PG,PE,ET
-- 
1.7.12.4.dirty
--
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