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    SubjectRe: Problems with SMP & ACPI powering off
    On Friday, 28 September 2007 15:22, Mark Lord wrote:
    > Rafael J. Wysocki wrote:
    > > On Friday, 28 September 2007 06:57, Len Brown wrote:
    > >> On Thursday 27 September 2007 18:00, Rafael J. Wysocki wrote:
    > >>> On Thursday, 27 September 2007 23:29, Mark Lord wrote:
    > >>>> Question: do we disable all CPUs except 0 when doing ACPI power off?
    > >>> No, but we should.
    > >> We used to.
    > >> It is absolutely mandatory -- else it confuses the BIOS on some boards
    > >> b/c it isn't expecting SMM to get entered from other than cpu0.
    > >
    > > Can we use the CPU hotplug for that, like in the suspend/hibernation case?
    > Well, so far it's working: about ten poweroffs since I patched it,
    > and no issues with any of them. Prior to that, it seemed like about
    > one in five poweroffs wouldn't (power off).
    > It'll take a lot more testing to confirm, though.
    > What can I call to determine if more than one CPU is enabled, anyway?
    > Here's the hack I'm using here, very situation (2 cores) specific,
    > and it still has some printk's leftover with a sleep so I have time
    > to read them before the lights go out. :)

    Well, we have disable_nonboot_cpus() that we use for suspend and that is
    supposed to be general.

    The question is when to call it.

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      Last update: 2007-09-28 15:33    [W:0.045 / U:1.604 seconds]
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