Re: [stable] [PATCH] Ignore bogus ACPI info for offline CPUs

Chris Wright
2007-05-21T17:12:19Z

* Darren Hart (dvhltc@us.ibm.com) wrote:
> On Saturday 19 May 2007 07:22:50 Thomas Gleixner wrote:
> > Booting a SMP kernel with maxcpus=1 on a SMP system leads to a hard
> > hang, because ACPI ignores the maxcpus setting and sends timer broadcast
> > info for the offline CPUs. This results in a stuck for ever call to
> > smp_call_function_single() on an offline CPU.
> >
> > Ignore the bogus information and print a kernel error to remind ACPI
> > folks to fix it.
> >
> > Affects 2.6.21 / 2.6.22-rc
> >
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
>
> When I first booted with this patch I received the following in a loop:
>
> irq 9: nobody cared (try booting with the "irqpoll" option)

What happens when booting w/out this patch? Don't want to add known
regression to -stable.

thanks,
-chris