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    SubjectRe: [PATCH v9 0/8] Parallel CPU bringup for x86_64
    Hello.

    On 20.02.2023 21:31, David Woodhouse wrote:
    > On Mon, 2023-02-20 at 17:40 +0100, Oleksandr Natalenko wrote:
    >> On pondělí 20. února 2023 17:20:13 CET David Woodhouse wrote:
    >> > On Mon, 2023-02-20 at 17:08 +0100, Oleksandr Natalenko wrote:
    >> > >
    >> > > I've applied this to the v6.2 kernel, and suspend/resume broke on
    >> > > my
    >> > > Ryzen 5950X desktop. The machine suspends just fine, but on
    >> > > resume
    >> > > the screen stays blank, and there's no visible disk I/O.
    >> > >
    >> > > Reverting the series brings suspend/resume back to working state.
    >> >
    >> > Hm, thanks. What if you add 'no_parallel_bringup' on the command
    >> > line?
    >>
    >> If the `no_parallel_bringup` param is added, the suspend/resume
    >> works.
    >
    > Thanks for the testing. Can I ask you to do one further test: apply the
    > series only as far as patch 6/8 'x86/smpboot: Support parallel startup
    > of secondary CPUs'.
    >
    > That will do the new startup asm sequence where each CPU finds its own
    > per-cpu data so it *could* work in parallel, but doesn't actually do
    > the bringup in parallel yet.

    With patches 1 to 6 (including) applied and no extra cmdline params
    added the resume doesn't work.

    > Does your box have a proper serial port?

    No, sorry. I know it'd help with getting logs, and I do have a
    serial-to-USB cable that I use for another machine, but in this one the
    port is not routed to outside. I think I can put a header there as the
    motherboard does have pins, but I'd have to buy one first. In theory, I
    can do that, but that won't happen within the next few weeks.

    P.S. Piotr Gorski (in Cc) also reported this: "My friend from CachyOS
    can confirm bugs with smpboot patches. AMD FX 6300 only shows 1 core
    when using smp boot patchset". Probably, he can reply to this thread and
    provide more details.

    --
    Oleksandr Natalenko (post-factum)

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