[PATCH] Alpha: convert to generic irq framework (generic part)
Thanks to Christoph for doing most of the work.
This allows automatic SMP IRQ affinity assignment other than default "all
interrupts on all CPUs" which is rather expensive. This might be useful if
the hardware can be programmed to distribute interrupts among different
CPUs, like Alpha does.
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index f26e534..8a64a48 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -68,7 +68,9 @@
*/
cpus_and(tmp, new_value, cpu_online_map);
if (cpus_empty(tmp))
- return -EINVAL;
+ /* Special case for empty set - allow the architecture
+ code to set default SMP affinity. */
+ return select_smp_affinity(irq) ? -EINVAL : full_count;
proc_set_irq_affinity(irq, new_value);