Re: [RESEND PATCH v5 00/12] Allow preemption during IPI completion waiting to improve real-time performance

[Sebastian Andrzej Siewior]

On 2026-05-13 20:45:12 [+0800], Chuyi Zhou wrote:
> Introduction
> ============
> 
> The vast majority of smp_call_function*() callers block until remote CPUs
> complete the IPI function execution. As smp_call_function*() runs with
> preemption disabled throughout, scheduling latency increases dramatically
> with the number of remote CPUs and other factors (such as interrupts being
> disabled).
…

Thank you for working on this.
I went through the series and I don't see anything wrong with it
conceptionally. I made a few comments on how to get
smp_call_function_many_cond() a bit improved/ readable but this is about
it.

For 1-3, 6-12:
 Reviewed-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

I am not too keen about that smp_processor_id() change, not sure if
flush_tlb_kernel_range() could get its own structure. Don't want to make
this series too complicated, that is the call of the x86 folks here.

Sebastian