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. Greetings, Rafael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/