Re: [PATCH v3 00/12] arm64: Add HOTPLUG_PARALLEL support for secondary CPUs

[Jinjie Ruan]

On 6/24/2026 8:16 PM, Will Deacon wrote:
> On Wed, Jun 24, 2026 at 05:25:25PM +0800, Jinjie Ruan wrote:
>> Support for parallel secondary CPU bringup is already utilized by x86,
>> MIPS, and RISC-V. This patch brings this capability to the arm64
>> architecture.
>>
>> Introduce CONFIG_HOTPLUG_PARALLEL_SMT to avoid primary SMT threads
>> to boot first constraint.
>>
>> And add a 'cpu' parameter to update_cpu_boot_status() to allow updating
>> the boot status at a per-CPU granularity during parallel bringup.
>>
>> Rework the global `secondary_data` and `__early_cpu_boot_status` accessed
>> during early boot into per-CPU arrays to allow secondary CPUs to boot
>> in parallel.
>>
>> And reuse `__cpu_logical_map` array in the early boot code in head.S
>> to resolve each secondary CPU's logical ID concurrently.
>>
>> This series includes a subset of the refactoring patches proposed
>> by Will Deacon, with further adjustments.
> 
> Sheesh, Jinjie, what are you doing?
> 
> I said yesterday that I would dust off the old series after the merge
> window:
> 
>   https://lore.kernel.org/all/ajqYaklhIyvaNLlk@willie-the-truck/
> 
> "Please just give me a week or so to rebase my changes and send them out
>  for discussion"
> 
> but instead, you've posted patches from me that are missing a bunch of
> fixes that need to be folded back in:
> 
>   https://web.git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/commit/?h=cpu-hotplug&id=2d5b8df5d4e2bbc142e3b4f21cabbca96e3da79d
> 

Hi Will,

I am terribly sorry for my impatience and the confusion this has caused.
I completely misread the situation and shouldn't have posted those
incomplete patches, especially when you explicitly asked for a week to
rebase them properly.

> so now you're asking people to review incomplete patches from somebody
> else.
> 
> Please just give me the time I asked for. If you want to help out in the
> meantime, there are plenty of patches that need reviewing...


It was a mistake on my part, and I sincerely apologize for wasting
community review resources and disrupting your schedule.

I will absolutely back off now and wait for your official series. Lesson
learned. Thanks for your patience and for calling me out on this.

Best regards,
Jinjie

> 
> Will
>