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SubjectRe: [External] Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64
On 21.02.2023 11:47, Usama Arif wrote:
> On 21/02/2023 10:27, David Woodhouse wrote:
>>
>> On 21 February 2023 09:49:51 GMT, Oleksandr Natalenko
>> <oleksandr@natalenko.name> wrote:
>>> On 21.02.2023 10:06, David Woodhouse wrote:
>>>> Why does arch/x86/kernel/acpi/sleep.c::x86_acpi_suspend_lowlevel()
>>>> set
>>>>
>>>> initial_gs = per_cpu_offset(smp_processor_id()) ?
>>>>
>>>> Would it not be CPU#0 that comes back up, and should it not get
>>>> per_cpu_offset(0) ?
>>>
>>> Wanna me try `initial_gs = per_cpu_offset(0);` too?
>>
>
> I think it might be smp_processor_id() and not 0 incase CPU0 was
> offline at the point the system was suspended?

Is it even possible for CPU 0 to be offline, at least on x86?

--
Oleksandr Natalenko (post-factum)

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