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SubjectRe: Panic starting 6.2.x and later 6.1.x kernels
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On 3/29/2023 14:20, David R wrote:
> On 29/03/2023 20:17, Limonciello, Mario wrote:
>> On 3/29/2023 14:14, David R wrote:
>>> I note that 6.2.8 still has:
>>>
>>> static bool __init acpi_is_processor_usable(u32 lapic_flags)
>>> {
>>>          if (lapic_flags & ACPI_MADT_ENABLED)
>>>                  return true;
>>>
>>>          if (acpi_support_online_capable && (lapic_flags &
>>> ACPI_MADT_ONLINE_CAPABLE))
>>>                  return true;
>>>
>>>          return false;
>>> }
>>>
>>> The flag getting set to false won't help unless the patch I tried
>>> previously is applied ?
>>>
>>> diff
>>> <https://lore.kernel.org/all/20230327191026.3454-2-eric.devolder@oracle.com/#iZ31arch:x86:kernel:acpi:boot.c> --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 1c38174b5f01..7b5b8ed018b0 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -193,7 +193,13 @@ static bool __init acpi_is_processor_usable(u32 lapic_flags)       if (lapic_flags & ACPI_MADT_ENABLED)
>>>           return true;
>>>   - if (acpi_support_online_capable && (lapic_flags &
>>> ACPI_MADT_ONLINE_CAPABLE)) + /* + * Prior to MADT.revision 5, the
>>> presence of the Local x2/APIC + * structure _implicitly_ noted a
>>> possible hotpluggable cpu. + * Starting with MADT.revision 5, the
>>> Online Capable bit + * _explicitly_ indicates a hotpluggable cpu. +
>>> */ + if (!acpi_support_online_capable || (lapic_flags &
>>> ACPI_MADT_ONLINE_CAPABLE))           return true;
>>>         return false;
>>> --
>>>
>>
>> You mean specifically this change:
>> https://lore.kernel.org/all/20230327191026.3454-2-eric.devolder@oracle.com/
>>
>> Yes; I suppose that still makes sense.
>>
> Yes, that's the one.
>
> But the fact that  that one worked own its own implies that my system
> never had the flag set in the first place?
>
> David

Right - your BIOS doesn't support MADT revision 5 which was introduced
as part of ACPI 6.3.

If you haven't already you should add a Tested-by tag for Eric's patch.

I think both mine and his coupled together should cover both of these
possible areas of breakage.

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