diff options
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 42a93621f5b0..951f093a96fe 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1407,9 +1407,21 @@ __init void prefill_possible_map(void) { int i, possible; - /* no processor from mptable or madt */ - if (!num_processors) - num_processors = 1; + /* No boot processor was found in mptable or ACPI MADT */ + if (!num_processors) { + int apicid = boot_cpu_physical_apicid; + int cpu = hard_smp_processor_id(); + + pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu); + + /* Make sure boot cpu is enumerated */ + if (apic->cpu_present_to_apicid(0) == BAD_APICID && + apic->apic_id_valid(apicid)) + generic_processor_info(apicid, boot_cpu_apic_version); + + if (!num_processors) + num_processors = 1; + } i = setup_max_cpus ?: 1; if (setup_possible_cpus == -1) { |