[PATCH] Fix interrupt distribution in ppc970

[paulus at samba.org (Paul Mackerras)]

Mohan Kumar M writes:

> To overcome this problem, I have created the patch, which
> checks for the condition if the machine is ppc970 based and maxcpus
> kernel parameter is specified. If the condition is met, the default
> distribution server is assigned to be current boot cpu instead of
> assigning from the gserver#s property.

It feels hacky to be basing this sort of thing on the PVR.  I would
like to understand the real problem better.  Is it that we are
sometimes setting default_distrib_server to point to a CPU which is
not running?  If so, why and how?  Is this something that is specific
to the firmware on IBM 970-based blade systems?  Is there in fact a
firmware bug that this works around?  Why don't we see it on non-970
based systems?

Paul.