linux-kernel - [PATCH] x86: use hard_smp_processor_id to get apic id in identify

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Date:	Tue, 25 Aug 2009 15:06:58 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: [PATCH] x86: use hard_smp_processor_id to get apic id in identify_cpu
 -v2



and leave phys_proc_id to use initial apic id.

otherwise, system with apci id lifting will have wrong apicid in
/proc/cpuinfo

-v2: update the one in detect_extended_topology too.

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

---
 arch/x86/kernel/cpu/addon_cpuid_features.c |    4 ++--
 arch/x86/kernel/cpu/common.c               |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6/arch/x86/kernel/cpu/common.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/common.c
+++ linux-2.6/arch/x86/kernel/cpu/common.c
@@ -715,7 +715,7 @@ static void __cpuinit generic_identify(s
 		c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF;
 #ifdef CONFIG_X86_32
 # ifdef CONFIG_X86_HT
-		c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
+		c->apicid = hard_smp_processor_id();
 # else
 		c->apicid = c->initial_apicid;
 # endif
@@ -772,7 +772,7 @@ static void __cpuinit identify_cpu(struc
 	}
 
 #ifdef CONFIG_X86_64
-	c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
+	c->apicid = hard_smp_processor_id();
 #endif
 
 	/*
Index: linux-2.6/arch/x86/kernel/cpu/addon_cpuid_features.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ linux-2.6/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -121,9 +121,9 @@ void __cpuinit detect_extended_topology(
 						 & core_select_mask;
 	c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid, core_plus_mask_width);
 	/*
-	 * Reinit the apicid, now that we have extended initial_apicid.
+	 * Reinit the apicid, now that we have extended apicid ?
 	 */
-	c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
+	c->apicid = hard_smp_processor_id();
 
 	c->x86_max_cores = (core_level_siblings / smp_num_siblings);
 
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