linux-kernel - [tip:x86/cpufeature] x86, cpufeature: Fix cpuid leaf 7 feature detection

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Message-ID: <tip-2494b030ba9334c7dd7df9b9f7abe4eacc950ec5@git.kernel.org>
Date:	Tue, 17 May 2011 21:31:08 GMT
From:	tip-bot for Fenghua Yu <fenghua.yu@...el.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/cpufeature] x86, cpufeature: Fix cpuid leaf 7 feature detection

Commit-ID:  2494b030ba9334c7dd7df9b9f7abe4eacc950ec5
Gitweb:     http://git.kernel.org/tip/2494b030ba9334c7dd7df9b9f7abe4eacc950ec5
Author:     Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Tue, 17 May 2011 12:33:26 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Tue, 17 May 2011 13:36:29 -0700

x86, cpufeature: Fix cpuid leaf 7 feature detection

CPUID leaf 7, subleaf 0 returns the maximum subleaf in EAX, not the
number of subleaves.  Since so far only subleaf 0 is defined (and only
the EBX bitfield) we do not need to qualify the test.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Link: http://lkml.kernel.org/r/1305660806-17519-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Cc: <stable@...nel.org> 2.6.36..39
---
 arch/x86/kernel/cpu/common.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index e2ced00..173f3a3 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -565,8 +565,7 @@ void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c)
 
 		cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx);
 
-		if (eax > 0)
-			c->x86_capability[9] = ebx;
+		c->x86_capability[9] = ebx;
 	}
 
 	/* AMD-defined flags: level 0x80000001 */
--
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