linux-kernel - [PATCH] x86: Don't copy per_cpu cpuinfo for BSP two times

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Date:	Fri, 21 Jan 2011 15:29:54 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Tejun Heo <tj@...nel.org>, Borislav Petkov <bp@...en8.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86: Don't copy per_cpu cpuinfo for BSP two times


smp_store_cpu_info(0) will do that.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/kernel/smpboot.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6/arch/x86/kernel/smpboot.c
@@ -1071,13 +1071,13 @@ void __init native_smp_prepare_cpus(unsi
 
 	preempt_disable();
 	smp_cpu_index_default();
-	memcpy(__this_cpu_ptr(&cpu_info), &boot_cpu_data, sizeof(cpu_info));
-	cpumask_copy(cpu_callin_mask, cpumask_of(0));
-	mb();
+
 	/*
 	 * Setup boot CPU information
 	 */
 	smp_store_cpu_info(0); /* Final full version of the data */
+	cpumask_copy(cpu_callin_mask, cpumask_of(0));
+	mb();
 #ifdef CONFIG_X86_32
 	boot_cpu_logical_apicid = logical_smp_processor_id();
 #endif
--
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