Re: default IRQ affinity change in v2.6.27 (breaking several SMP PPC based systems)

From: Kumar Gala <redacted>
Date: Fri, 24 Oct 2008 10:39:05 -0500

As for making it ARCH specific, that doesn't really help since not
all PPC hw has the limitation I spoke of.  Not even all MPIC (in our
cases) have the limitation.

Since the PPC code knows exactly which MPICs have the problem the
PPC code is where the constraining can occur.

I agree completely with the suggestion that the arch code has to
interpret the cpumask as appropriate for the hardware, since the
user can stick "illegal" values there anyways.