powerpc/mpic: Fix regression caused by change of default IRQ affinity

The Freescale implementation of MPIC only allows a single CPU destination
for non-IPI interrupts.  We add a flag to the mpic_init to distinquish
these variants of MPIC.  We pull in the irq_choose_cpu from sparc64 to
select a single CPU as the destination of the interrupt.

This is to deal with the fact that the default smp affinity was
changed by commit 18404756765c713a0be4eb1082920c04822ce588 ("genirq:
Expose default irq affinity mask (take 3)") to be all CPUs.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/86xx/pic.c b/arch/powerpc/platforms/86xx/pic.c
index 8881c5de500d..668275d9e668 100644
--- a/arch/powerpc/platforms/86xx/pic.c
+++ b/arch/powerpc/platforms/86xx/pic.c
@@ -44,7 +44,8 @@ void __init mpc86xx_init_irq(void)
 
         mpic = mpic_alloc(np, res.start,
                         MPIC_PRIMARY | MPIC_WANTS_RESET |
-                        MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
+                        MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS |
+                        MPIC_SINGLE_DEST_CPU,
                         0, 256, " MPIC     ");
         of_node_put(np);
         BUG_ON(mpic == NULL);