On Tue, Oct 09, 2007 at 04:27:06PM -0700, Linus Torvalds wrote: > > > On Wed, 10 Oct 2007, Thomas Gleixner wrote: > > > > Wrapping it into a #ifdef CONFIG_X86 would be sufficient. > > Well, the ppc oops seems to be a ppc bug regardless. > > If CPU_HOTPLUG isn't defined, the thing does nothing. And if it is > defined, I don't see why/how ppc can validly oops. So I think the first > thing to do is to try to figure out why it oopses, not to disable it for > ppc.
The machine Paul tried on most likely has MPIC interrupt controller, and the oops was when the pseries_cpu_disable tried calling XICS code instead. It's not surprising that it failed, I don't think IBM has (traditionally) cared about cpu hotplug on those machines. So the PPC-side fix is to not enable cpu hotplug on mpic-based systems. I'll follow up with a patch, but I have no way to test it since I only have one POWER5 machine, no other IBM hardware. I'd appreciate it if someone with hardware could verify it. -Olof - 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/
