linux-kernel - [PATCH 3/6] x86: Unify APERF/MPERF support

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Message-Id: <1270065406-1814-4-git-send-email-bp@amd64.org>
Date:	Wed, 31 Mar 2010 21:56:43 +0200
From:	Borislav Petkov <bp@...64.org>
To:	<hpa@...or.com>, <mingo@...e.hu>, <tglx@...utronix.de>,
	<akpm@...ux-foundation.org>
Cc:	davej@...hat.com, trenn@...e.de, linux@...inikbrodowski.net,
	cpufreq@...r.kernel.org, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>
Subject: [PATCH 3/6] x86: Unify APERF/MPERF support

From: Borislav Petkov <borislav.petkov@....com>

Initialize this CPUID flag feature in common code. It could be made a
standalone function later, maybe, if more functionality is duplicated.

Signed-off-by: Borislav Petkov <borislav.petkov@....com>
Reviewed-by: Thomas Renninger <trenn@...e.de>
---
 arch/x86/kernel/cpu/addon_cpuid_features.c |    8 ++++++++
 arch/x86/kernel/cpu/intel.c                |    6 ------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index ead2a1c..fd1fc19 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -54,6 +54,14 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
 		if (regs[cb->reg] & (1 << cb->bit))
 			set_cpu_cap(c, cb->feature);
 	}
+
+	/*
+	 * common AMD/Intel features
+	 */
+	if (c->cpuid_level >= 6) {
+		if (cpuid_ecx(6) & 0x1)
+			set_cpu_cap(c, X86_FEATURE_APERFMPERF);
+	}
 }
 
 /* leaf 0xb SMT level */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 7e1cca1..3830258 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -352,12 +352,6 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 			set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
 	}
 
-	if (c->cpuid_level > 6) {
-		unsigned ecx = cpuid_ecx(6);
-		if (ecx & 0x01)
-			set_cpu_cap(c, X86_FEATURE_APERFMPERF);
-	}
-
 	if (cpu_has_xmm2)
 		set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
 	if (cpu_has_ds) {
-- 
1.7.0

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