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

    In my case, admittedly, the error does not occur, while I have
    information from a friend that AMD FX 6300 only shows 1 core when using
    smp boot patchset, so mentioned Oleksandr. Probably soon the friend will
    join the discussion and will be able to provide more information.

    W dniu 20.02.2023 o 22:23, Oleksandr Natalenko pisze:
    > 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.
    >

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