Re: [PATCH v8 9/9] x86/smpboot: Serialize topology updates for secondary bringup

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On 13 February 2023 21:43:13 CET, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>On Thu, Feb 09 2023 at 15:41, Usama Arif wrote:
>> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
>>
>> The toplogy update is performed by the AP via smp_callin() after the BSP
>> has called do_wait_cpu_initialized(), setting the AP's bit in
>> cpu_callout_mask to allow it to proceed.
>>
>> In preparation to enable further parallelism of AP bringup, add locking to
>> serialize the update even if multiple APs are (in future) permitted to
>> proceed through the next stages of bringup in parallel.
>
>This one is also only relevant for further parallelisation, right?

I believe so, yes. But it's low-hanging fruit and might as well go in now.




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