linux-kernel - [PATCH v6 09/12] x86/common.c: Init CPU0 data during CPU0 online

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Date:	Thu, 10 May 2012 09:16:51 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H Peter Anvin" <hpa@...or.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Tony Luck" <tony.luck@...el.com>,
	"Arjan Dan De Ven" <arjan@...ux.intel.com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Len Brown" <len.brown@...el.com>,
	"Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"Randy Dunlap" <rdunlap@...otime.net>,
	"Chen Gong" <gong.chen@...ux.intel.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-pm" <linux-pm@...r.kernel.org>, "x86" <x86@...nel.org>
Cc:	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH v6 09/12] x86/common.c: Init CPU0 data during CPU0 online

From: Fenghua Yu <fenghua.yu@...el.com>

During CPU0 online, enable x2apic, re-init mcheck, set_numa_node, add numa mask,
and enable sep cpu for CPU0.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/include/asm/processor.h |    1 +
 arch/x86/kernel/cpu/common.c     |   17 ++++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index ccbb1ea..81d6993 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -169,6 +169,7 @@ extern struct pt_regs *idle_regs(struct pt_regs *);
 
 extern void early_cpu_init(void);
 extern void identify_boot_cpu(void);
+extern void identify_boot_cpu_online(void);
 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 extern void print_cpu_info(struct cpuinfo_x86 *);
 void print_cpu_msr(struct cpuinfo_x86 *);
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index cf79302..7f9f481 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -913,6 +913,18 @@ void __init identify_boot_cpu(void)
 #endif
 }
 
+void __cpuinit identify_boot_cpu_online(void)
+{
+	mcheck_cpu_init(&boot_cpu_data);
+
+#ifdef CONFIG_NUMA
+	numa_add_cpu(smp_processor_id());
+#endif
+#ifdef CONFIG_X86_32
+	enable_sep_cpu();
+#endif
+}
+
 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c)
 {
 	BUG_ON(c == &boot_cpu_data);
@@ -1185,7 +1197,7 @@ void __cpuinit cpu_init(void)
 	oist = &per_cpu(orig_ist, cpu);
 
 #ifdef CONFIG_NUMA
-	if (cpu != 0 && percpu_read(numa_node) == 0 &&
+	if (percpu_read(numa_node) == 0 &&
 	    early_cpu_to_node(cpu) != NUMA_NO_NODE)
 		set_numa_node(early_cpu_to_node(cpu));
 #endif
@@ -1217,8 +1229,7 @@ void __cpuinit cpu_init(void)
 	barrier();
 
 	x86_configure_nx();
-	if (cpu != 0)
-		enable_x2apic();
+	enable_x2apic();
 
 	/*
 	 * set up and load the per-CPU TSS
-- 
1.6.0.3

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