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

David Miller wrote:

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

quoted

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.

Sorry for delay in replying to this. And sorry for causing regression on some
ppc platforms.
I totally agree with what Dave said above. ALL_CPUS is a sane default,
platform code has to sanity check masks passed via set_affinity() calls
anyway. So I beleive it should be fixed in the platform code.

Max