On 2014/1/9 20:12, Rafael J. Wysocki wrote:
> On Thursday, January 09, 2014 04:15:19 PM Jiang Liu wrote:
>> Enhance ACPI CPU hotplug driver to print clear error message and
>> bail out early if BIOS returns wrong value in ACPI MADT table or
>> _MAT method. Otherwise it will add the CPU device even if failed
>> to get APIC ID and fails any operations against sysfs interface:
>> /sys/devices/system/cpu/cpux/online
>>
>> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
>
> Do you have any pointers to bug reports regarding this etc.? If so,
> it would be good to add links to them to the commit log.
Hi Rafael,
I have no bug id for this. It was found during verifying an
internal BIOS version, so no external bug id for it yet.
Cheers!
Gerry
>
> Thanks!
>
>> ---
>> drivers/acpi/acpi_processor.c | 24 ++++++++++++++----------
>> 1 file changed, 14 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
>> index 3c1d6b0..6ce71b0 100644
>> --- a/drivers/acpi/acpi_processor.c
>> +++ b/drivers/acpi/acpi_processor.c
>> @@ -212,7 +212,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
>> union acpi_object object = { 0 };
>> struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
>> struct acpi_processor *pr = acpi_driver_data(device);
>> - int cpu_index, device_declaration = 0;
>> + int apic_id, cpu_index, device_declaration = 0;
>> acpi_status status = AE_OK;
>> static int cpu0_initialized;
>> unsigned long long value;
>> @@ -258,18 +258,21 @@ static int acpi_processor_get_info(struct acpi_device *device)
>> device_declaration = 1;
>> pr->acpi_id = value;
>> }
>> - pr->apic_id = acpi_get_apicid(pr->handle, device_declaration,
>> - pr->acpi_id);
>> - cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
>>
>> - /* Handle UP system running SMP kernel, with no LAPIC in MADT */
>> - if (!cpu0_initialized && (cpu_index == -1) &&
>> - (num_online_cpus() == 1)) {
>> - cpu_index = 0;
>> + apic_id = acpi_get_apicid(pr->handle, device_declaration, pr->acpi_id);
>> + if (apic_id < 0) {
>> + acpi_handle_err(pr->handle, "failed to get CPU APIC ID.\n");
>> + return -ENODEV;
>> }
>> + pr->apic_id = apic_id;
>>
>> - cpu0_initialized = 1;
>> -
>> + cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
>> + if (!cpu0_initialized) {
>> + cpu0_initialized = 1;
>> + /* Handle UP system running SMP kernel, with no LAPIC in MADT */
>> + if ((cpu_index == -1) && (num_online_cpus() == 1))
>> + cpu_index = 0;
>> + }
>> pr->id = cpu_index;
>>
>> /*
>> @@ -282,6 +285,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
>> if (ret)
>> return ret;
>> }
>> +
>> /*
>> * On some boxes several processors use the same processor bus id.
>> * But they are located in different scope. For example:
>>
>
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