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    SubjectRe: [PATCH v6 08/11] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel
    Date
    On Thu, Feb 02 2023 at 21:56, Usama Arif wrote:

    > From: David Woodhouse <dwmw@amazon.co.uk>
    >
    > 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

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