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, 0 deletions

diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index 34d9ac433ace..c2ccca53b991 100644
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -355,6 +355,8 @@ struct mpic
 #define MPIC_NO_BIAS                    0x00000400
 /* Ignore NIRQS as reported by FRR */
 #define MPIC_BROKEN_FRR_NIRQS           0x00000800
+/* Destination only supports a single CPU at a time */
+#define MPIC_SINGLE_DEST_CPU            0x00001000
 
 /* MPIC HW modification ID */
 #define MPIC_REGSET_MASK                0xf0000000