Re: [PATCH v6 08/11] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel

[Thomas Gleixner]

On Thu, Feb 02 2023 at 21:56, Usama Arif wrote:

> From: David Woodhouse <dwmw@xxxxxxxxxxxx>
>
> When the APs can find their own APIC ID without assistance, we can do

We can do nothing ... Again, read Documentation/process ...

> the AP bringup in parallel.
>  /**
>   * arch_disable_smp_support() - disables SMP support for x86 at runtime
>   */
> @@ -1550,6 +1560,10 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
>  		do_parallel_bringup = false;
>  	}
>  
> +	if (do_parallel_bringup)
> +		cpuhp_setup_state_nocalls(CPUHP_BP_PARALLEL_DYN, "x86/cpu:kick",
> +					  native_cpu_kick, NULL);

https://www.kernel.org/doc/html/latest/process/maintainer-tip.html#bracket-rules

Thanks,

        tglx