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Diffstat (limited to 'arch/x86_64/kernel/setup.c')
-rw-r--r--arch/x86_64/kernel/setup.c25
1 files changed, 12 insertions, 13 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index b9fd0252c27..99f038ede23 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -719,7 +719,6 @@ static void __init display_cacheinfo(struct cpuinfo_x86 *c)
}
}
-#ifdef CONFIG_SMP
/*
* On a AMD dual core setup the lower bits of the APIC id distingush the cores.
* Assumes number of cores is a power of two.
@@ -729,16 +728,24 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
#ifdef CONFIG_SMP
int cpu = smp_processor_id();
int node = 0;
+ unsigned bits;
if (c->x86_num_cores == 1)
return;
- /* Fix up the APIC ID following the AMD specification. */
- cpu_core_id[cpu] >>= hweight32(c->x86_num_cores - 1);
+
+ bits = 0;
+ while ((1 << bits) < c->x86_num_cores)
+ bits++;
+
+ /* Low order bits define the core id (index of core in socket) */
+ cpu_core_id[cpu] = phys_proc_id[cpu] & ((1 << bits)-1);
+ /* Convert the APIC ID into the socket ID */
+ phys_proc_id[cpu] >>= bits;
#ifdef CONFIG_NUMA
/* When an ACPI SRAT table is available use the mappings from SRAT
instead. */
if (acpi_numa <= 0) {
- node = cpu_core_id[cpu];
+ node = phys_proc_id[cpu];
if (!node_online(node))
node = first_node(node_online_map);
cpu_to_node[cpu] = node;
@@ -746,18 +753,11 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
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
}
-#else
-static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
-{
-}
-#endif
static int __init init_amd(struct cpuinfo_x86 *c)
{
@@ -963,8 +963,7 @@ void __init early_identify_cpu(struct cpuinfo_x86 *c)
}
#ifdef CONFIG_SMP
- phys_proc_id[smp_processor_id()] =
- cpu_core_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
+ phys_proc_id[smp_processor_id()] = (cpuid_ebx(1) >> 24) & 0xff;
#endif
}