diff options
| -rw-r--r-- | arch/x86/kernel/cpu/topology.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c index c67120657e55..a6d045b15ebd 100644 --- a/arch/x86/kernel/cpu/topology.c +++ b/arch/x86/kernel/cpu/topology.c @@ -272,6 +272,10 @@ int topology_hotplug_apic(u32 apic_id, u32 acpi_id) if (apic_id >= MAX_LOCAL_APIC) return -EINVAL; + /* Reject if the APIC ID was not registered during enumeration. */ + if (!test_bit(apic_id, apic_maps[TOPO_SMT_DOMAIN].map)) + return -ENODEV; + cpu = topo_lookup_cpuid(apic_id); if (cpu < 0) { if (topo_info.nr_assigned_cpus >= nr_cpu_ids) |