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x86/ACPI: keep x86_cpu_to_acpiid mapping valid on CPU hotplug

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We may or may not have all possible CPUs in MADT on boot but in any
case we're overwriting x86_cpu_to_acpiid mapping with U32_MAX when
acpi_register_lapic() is called again on the CPU hotplug path:

acpi_processor_hotadd_init()
  -> acpi_map_cpu()
    -> acpi_register_lapic()

As we have the required acpi_id information in acpi_processor_hotadd_init()
propagate it to acpi_map_cpu() to always keep x86_cpu_to_acpiid
mapping valid.

Reported-by: Andrew Jones <[email protected]>
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Vitaly Kuznetsov 2017-02-06 18:01:51 +01:00 • committed by Rafael J. Wysocki
commit febf240741
4 changed files with 9 additions and 6 deletions
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4
drivers/acpi/acpi_processor.c
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@ -165,7 +165,7 @@ static int acpi_processor_errata(void)
#ifdef CONFIG_ACPI_HOTPLUG_CPU
int __weak acpi_map_cpu(acpi_handle handle,
phys_cpuid_t physid, int *pcpu)
phys_cpuid_t physid, u32 acpi_id, int *pcpu)
{
return -ENODEV;
}
@ -203,7 +203,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
cpu_maps_update_begin();
cpu_hotplug_begin();
ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id);
ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);
if (ret)
goto out;