diff options
Diffstat (limited to 'arch/x86_64/kernel/setup.c')
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index b9fd0252c279..99f038ede23c 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 } |