linux-kernel - [PATCH tip:x86/mm 2/3] x86: Use this_cpu_has for thermal

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Message-ID: <20110312115046.GD2005@htj.dyndns.org>
Date:	Sat, 12 Mar 2011 12:50:46 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	Christoph Lameter <cl@...ux.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>
Subject: [PATCH tip:x86/mm 2/3] x86: Use this_cpu_has for thermal_interrupt
 current cpu

From: Christoph Lameter <cl@...ux.com>

It is more effective to use a segment prefix instead of calculating the
address of the current cpu area amd then testing flags.

Signed-off-by: Christoph Lameter <cl@...ux.com>
Acked-by: Tejun Heo <tj@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/therm_throt.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Index: work/arch/x86/kernel/cpu/mcheck/therm_throt.c
===================================================================
--- work.orig/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ work/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -355,7 +355,6 @@ static void notify_thresholds(__u64 msr_
 static void intel_thermal_interrupt(void)
 {
 	__u64 msr_val;
-	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
 
 	rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
 
@@ -367,19 +366,19 @@ static void intel_thermal_interrupt(void
 				CORE_LEVEL) != 0)
 		mce_log_therm_throt_event(CORE_THROTTLED | msr_val);
 
-	if (cpu_has(c, X86_FEATURE_PLN))
+	if (this_cpu_has(X86_FEATURE_PLN))
 		if (therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
 					POWER_LIMIT_EVENT,
 					CORE_LEVEL) != 0)
 			mce_log_therm_throt_event(CORE_POWER_LIMIT | msr_val);
 
-	if (cpu_has(c, X86_FEATURE_PTS)) {
+	if (this_cpu_has(X86_FEATURE_PTS)) {
 		rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
 		if (therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
 					THERMAL_THROTTLING_EVENT,
 					PACKAGE_LEVEL) != 0)
 			mce_log_therm_throt_event(PACKAGE_THROTTLED | msr_val);
-		if (cpu_has(c, X86_FEATURE_PLN))
+		if (this_cpu_has(X86_FEATURE_PLN))
 			if (therm_throt_process(msr_val &
 					PACKAGE_THERM_STATUS_POWER_LIMIT,
 					POWER_LIMIT_EVENT,
--
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