acpi throttling: Use this_cpu_has and simplify code current cpu

With the this_cpu_xx we no longer need to pass an acpi
structure to the msr management code. Simplifies code and improves
performance.

NOTE: This code is x86 specific (see #ifdef CONFIG_X86) but not under
      arch/x86.
Signed-off-by: NChristoph Lameter <cl@linux.com>
Acked-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NTejun Heo <tj@kernel.org>

drivers/acpi/processor_throttling.c

@@ -710,20 +710,14 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
 }
 
 #ifdef CONFIG_X86
-static int acpi_throttling_rdmsr(struct acpi_processor *pr,
-					u64 *value)
+static int acpi_throttling_rdmsr(u64 *value)
 {
-	struct cpuinfo_x86 *c;
 	u64 msr_high, msr_low;
-	unsigned int cpu;
 	u64 msr = 0;
 	int ret = -1;
 
-	cpu = pr->id;
-	c = &cpu_data(cpu);
-
-	if ((c->x86_vendor != X86_VENDOR_INTEL) ||
-		!cpu_has(c, X86_FEATURE_ACPI)) {
+	if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
+		!this_cpu_has(X86_FEATURE_ACPI)) {
 		printk(KERN_ERR PREFIX
 			"HARDWARE addr space,NOT supported yet\n");
 	} else {
@@ -738,18 +732,13 @@ static int acpi_throttling_rdmsr(struct acpi_processor *pr,
 	return ret;
 }
 
-static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value)
+static int acpi_throttling_wrmsr(u64 value)
 {
-	struct cpuinfo_x86 *c;
-	unsigned int cpu;
 	int ret = -1;
 	u64 msr;
 
-	cpu = pr->id;
-	c = &cpu_data(cpu);
-
-	if ((c->x86_vendor != X86_VENDOR_INTEL) ||
-		!cpu_has(c, X86_FEATURE_ACPI)) {
+	if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
+		!this_cpu_has(X86_FEATURE_ACPI)) {
 		printk(KERN_ERR PREFIX
 			"HARDWARE addr space,NOT supported yet\n");
 	} else {
@@ -761,15 +750,14 @@ static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value)
 	return ret;
 }
 #else
-static int acpi_throttling_rdmsr(struct acpi_processor *pr,
-				u64 *value)
+static int acpi_throttling_rdmsr(u64 *value)
 {
 	printk(KERN_ERR PREFIX
 		"HARDWARE addr space,NOT supported yet\n");
 	return -1;
 }
 
-static int acpi_throttling_wrmsr(struct acpi_processor *pr, u64 value)
+static int acpi_throttling_wrmsr(u64 value)
 {
 	printk(KERN_ERR PREFIX
 		"HARDWARE addr space,NOT supported yet\n");
@@ -801,7 +789,7 @@ static int acpi_read_throttling_status(struct acpi_processor *pr,
 		ret = 0;
 		break;
 	case ACPI_ADR_SPACE_FIXED_HARDWARE:
-		ret = acpi_throttling_rdmsr(pr, value);
+		ret = acpi_throttling_rdmsr(value);
 		break;
 	default:
 		printk(KERN_ERR PREFIX "Unknown addr space %d\n",
@@ -834,7 +822,7 @@ static int acpi_write_throttling_state(struct acpi_processor *pr,
 		ret = 0;
 		break;
 	case ACPI_ADR_SPACE_FIXED_HARDWARE:
-		ret = acpi_throttling_wrmsr(pr, value);
+		ret = acpi_throttling_wrmsr(value);
 		break;
 	default:
 		printk(KERN_ERR PREFIX "Unknown addr space %d\n",