linux-kernel - [PATCH 6/10 -tip] x86: early_init_intel() user of Advanced Power Management features

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Date:	Tue, 12 May 2009 21:11:48 +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 6/10 -tip] x86: early_init_intel() user of Advanced Power
 Management features


use X86_FEATURE_CONSTANT_TSC to determine TSC Invariance

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/kernel/cpu/intel.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 7437fa1..62130a0 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -61,14 +61,14 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
 		c->x86_phys_bits = 36;
 
 	/*
-	 * 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.
 	 *
 	 * It is also reliable across cores and sockets. (but not across
 	 * cabinets - we turn it off in that case explicitly.)
 	 */
-	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);
 		set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
 		sched_clock_stable = 1;
-- 
1.6.0.6



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