Re: latest -git: WARNING: at arch/x86/kernel/ipi.c:123 send_IPI_mask_bitmask+0xc3/0xe0()

H. Peter Anvin
2008-08-22T06:25:42Z

Andi Kleen wrote:
>> You may want to see if this patch fixes the problem; it does *NOT* have
>> the correct error behaviour (some of the intervening layers don't
>> propagate errors), but it should make the fault go away.
>
> The alternative would be to just take out those msr_on_cpu()
> interfaces again. Right now they are useless in the kernel,
> but still cause problems.
>
> They were only added for OpenVZ's vCPUs which they back then
> promised me would hit mainline soon. But that was some time
> ago and there wasn't much progress on this.
>
> -Andi

We still need the equivalent functionality, though. The midlayer
(msr_on_cpu) may be pointless, but that doesn't change the fact that
putting this functionality in the lower layer (smp_call_function_single)
makes more sense.

-hpa