From: "Andi Kleen" <ak@suse.de>

Last round hopefully of cpu_core_id changes hopefully fow now: 

- Always initialize cpu_core_id for all CPUs, even when no dual core setup
  is detected.  This prevents funny /proc/cpuinfo output

- Do the same with phys_proc_id[] even when no HyperThreading - dito.

- Use the CPU APIC-ID from CPUID 1 instead of the linux virtual CPU number
  to identify the core for AMD dual core setups.

Patch for i386/x86-64.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 arch/i386/kernel/cpu/amd.c    |    7 +++----
 arch/i386/kernel/cpu/common.c |    7 +++++++
 arch/x86_64/kernel/setup.c    |   11 ++++++++++-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff -puN arch/i386/kernel/cpu/amd.c~x86_64-fix-defaults-for-physical-core-id-in arch/i386/kernel/cpu/amd.c
--- 25/arch/i386/kernel/cpu/amd.c~x86_64-fix-defaults-for-physical-core-id-in	2005-05-13 22:54:37.000000000 -0700
+++ 25-akpm/arch/i386/kernel/cpu/amd.c	2005-05-13 22:54:37.000000000 -0700
@@ -24,9 +24,6 @@ __asm__(".align 4\nvide: ret");
 
 static void __init init_amd(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_SMP
-	int cpu = c == &boot_cpu_data ? 0 : c - cpu_data;
-#endif
 	u32 l, h;
 	int mbytes = num_physpages >> (20-PAGE_SHIFT);
 	int r;
@@ -205,7 +202,9 @@ static void __init init_amd(struct cpuin
 	 * of two.
 	 */
 	if (c->x86_num_cores > 1) {
-		cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
+		int cpu = smp_processor_id();
+		/* Fix up the APIC ID following AMD specifications. */
+		cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
 		printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
 		       cpu, c->x86_num_cores, cpu_core_id[cpu]);
 	}
diff -puN arch/i386/kernel/cpu/common.c~x86_64-fix-defaults-for-physical-core-id-in arch/i386/kernel/cpu/common.c
--- 25/arch/i386/kernel/cpu/common.c~x86_64-fix-defaults-for-physical-core-id-in	2005-05-13 22:54:37.000000000 -0700
+++ 25-akpm/arch/i386/kernel/cpu/common.c	2005-05-13 22:54:37.000000000 -0700
@@ -243,6 +243,13 @@ static void __init early_cpu_detect(void
 	}
 
 	early_intel_workaround(c);
+
+#ifdef CONFIG_SMP
+#ifdef CONFIG_X86_HT
+	phys_proc_id[smp_processor_id()] =
+#endif
+	cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
+#endif
 }
 
 void __init generic_identify(struct cpuinfo_x86 * c)
diff -puN arch/x86_64/kernel/setup.c~x86_64-fix-defaults-for-physical-core-id-in arch/x86_64/kernel/setup.c
--- 25/arch/x86_64/kernel/setup.c~x86_64-fix-defaults-for-physical-core-id-in	2005-05-13 22:54:37.000000000 -0700
+++ 25-akpm/arch/x86_64/kernel/setup.c	2005-05-13 22:54:37.000000000 -0700
@@ -731,7 +731,8 @@ static void __init amd_detect_cmp(struct
 	int node = 0;
 	if (c->x86_num_cores == 1)
 		return;
-	cpu_core_id[cpu] = cpu >> hweight32(c->x86_num_cores - 1);
+	/* Fix up the APIC ID following the AMD specification. */
+ 	cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
 
 #ifdef CONFIG_NUMA
 	/* When an ACPI SRAT table is available use the mappings from SRAT
@@ -745,6 +746,9 @@ static void __init amd_detect_cmp(struct
 		node = cpu_to_node[cpu];
 	}
 #endif
+	/* For now: - better than BAD_APIC_ID at least*/
+	phys_proc_id[cpu] = cpu_core_id[cpu];
+
 	printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
 			cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
 #endif
@@ -959,6 +963,11 @@ void __init early_identify_cpu(struct cp
 		/* Have CPUID level 0 only - unheard of */
 		c->x86 = 4;
 	}
+
+#ifdef CONFIG_SMP
+	phys_proc_id[smp_processor_id()] =
+	cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
+#endif
 }
 
 /*
_