linux-kernel - [PATCH 7/10 -tip] x86: early_init_amd() user of Advanced Power Management features

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Date:	Tue, 12 May 2009 21:12:21 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...nel.org>,
	Robert Richter <robert.richter@....com>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>
Subject: [PATCH 7/10 -tip] x86: early_init_amd() user of Advanced Power
 Management features


use X86_FEATURE_CONSTANT_TSC to determine TSC Invariant

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/kernel/cpu/amd.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 7e4a459..1d36ac4 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -334,13 +334,12 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 	early_init_amd_mc(c);
 
 	/*
-	 * c->x86_power is 8000_0007 edx. Bit 8 is TSC runs at constant rate
-	 * with P/T states and does not stop in deep C-states
+	 * Advanced power management is 8000_0007 edx.
+	 * Bit 8 is TSC runs at constant rate with P/T states
+	 * and does not stop in deep C-states
 	 */
-	if (c->x86_power & (1 << 8)) {
-		set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
+	if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
 		set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC);
-	}
 
 #ifdef CONFIG_X86_64
 	set_cpu_cap(c, X86_FEATURE_SYSCALL32);
-- 
1.6.0.6



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