linux-kernel - [PATCH 3.5/9] x86: Use local variable to cache smp_processor_id() in setup_local

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Message-ID: <4CDD17A7.5060302@kernel.org>
Date:	Fri, 12 Nov 2010 11:32:07 +0100
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, x86@...nel.org, eric.dumazet@...il.com,
	yinghai@...nel.org
Subject: [PATCH 3.5/9] x86: Use local variable to cache smp_processor_id()
 in setup_local_APIC()

This is a trivial clean up.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Yinghai Lu <yinghai@...nel.org>
---
Separated out from patch 4 as suggested by Yinghai Lu.

Thanks.

 arch/x86/kernel/apic/apic.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

Index: work/arch/x86/kernel/apic/apic.c
===================================================================
--- work.orig/arch/x86/kernel/apic/apic.c
+++ work/arch/x86/kernel/apic/apic.c
@@ -1202,6 +1202,7 @@ static void __cpuinit lapic_setup_esr(vo
  */
 void __cpuinit setup_local_APIC(void)
 {
+	int cpu = smp_processor_id();
 	unsigned int value, queued;
 	int i, j, acked = 0;
 	unsigned long long tsc = 0, ntsc;
@@ -1343,21 +1344,19 @@ void __cpuinit setup_local_APIC(void)
 	 * TODO: set up through-local-APIC from through-I/O-APIC? --macro
 	 */
 	value = apic_read(APIC_LVT0) & APIC_LVT_MASKED;
-	if (!smp_processor_id() && (pic_mode || !value)) {
+	if (!cpu && (pic_mode || !value)) {
 		value = APIC_DM_EXTINT;
-		apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n",
-				smp_processor_id());
+		apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", cpu);
 	} else {
 		value = APIC_DM_EXTINT | APIC_LVT_MASKED;
-		apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n",
-				smp_processor_id());
+		apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", cpu);
 	}
 	apic_write(APIC_LVT0, value);

 	/*
 	 * only the BP should see the LINT1 NMI signal, obviously.
 	 */
-	if (!smp_processor_id())
+	if (!cpu)
 		value = APIC_DM_NMI;
 	else
 		value = APIC_DM_NMI | APIC_LVT_MASKED;
@@ -1369,7 +1368,7 @@ void __cpuinit setup_local_APIC(void)

 #ifdef CONFIG_X86_MCE_INTEL
 	/* Recheck CMCI information after local APIC is up on CPU #0 */
-	if (smp_processor_id() == 0)
+	if (cpu == 0)
 		cmci_recheck();
 #endif
 }
--
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