[PATCH] x86_64: Use X86_FEATURE_CONSTANT_TSC now to clean up Intel speedstep drivers

They previously tried to figure this out on their own.

Suggested by Venkatesh.

Cc: venkatesh.pallipadi@intel.com
Cc: davej@redhat.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c

@@ -40,8 +40,6 @@
 #include <linux/acpi.h>
 #include <acpi/processor.h>
 
-#include "speedstep-est-common.h"
-
 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
 
 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
@@ -367,6 +365,7 @@ acpi_cpufreq_cpu_init (
 	unsigned int		cpu = policy->cpu;
 	struct cpufreq_acpi_io	*data;
 	unsigned int		result = 0;
+	struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
 
 	union acpi_object		arg0 = {ACPI_TYPE_BUFFER};
 	u32				arg0_buf[3];
@@ -390,7 +389,7 @@ acpi_cpufreq_cpu_init (
 	if (result)
 		goto err_free;
 
-	if (is_const_loops_cpu(cpu)) {
+	if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
 		acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
 	}
 

arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c

@@ -35,8 +35,6 @@
 #include <asm/processor.h>
 #include <asm/cpufeature.h>
 
-#include "speedstep-est-common.h"
-
 #define PFX		"speedstep-centrino: "
 #define MAINTAINER	"Jeremy Fitzhardinge <jeremy@goop.org>"
 
@@ -493,12 +491,13 @@ static int centrino_cpu_init(struct cpufreq_policy *policy)
 	unsigned l, h;
 	int ret;
 	int i;
+	struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
 
 	/* Only Intel makes Enhanced Speedstep-capable CPUs */
 	if (cpu->x86_vendor != X86_VENDOR_INTEL || !cpu_has(cpu, X86_FEATURE_EST))
 		return -ENODEV;
 
-	if (is_const_loops_cpu(policy->cpu)) {
+	if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) {
 		centrino_driver.flags |= CPUFREQ_CONST_LOOPS;
 	}
 

arch/i386/kernel/cpu/cpufreq/speedstep-est-common.h

@@ -1,25 +0,0 @@
-/*
- * Routines common for drivers handling Enhanced Speedstep Technology
- *  Copyright (C) 2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
- *
- *  Licensed under the terms of the GNU GPL License version 2 -- see
- *  COPYING for details.
- */
-
-static inline int is_const_loops_cpu(unsigned int cpu)
-{
-	struct cpuinfo_x86 	*c = cpu_data + cpu;
-
-	if (c->x86_vendor != X86_VENDOR_INTEL || !cpu_has(c, X86_FEATURE_EST))
-		return 0;
-
-	/*
-	 * on P-4s, the TSC runs with constant frequency independent of cpu freq
-	 * when we use EST
-	 */
-	if (c->x86 == 0xf)
-		return 1;
-
-	return 0;
-}
-