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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2006-01-06 00:12:21 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:40 -0800
commiteee45269b0f5979c70bc151c6c2f4e5f4f5ababe (patch)
treea8ed14ee532ea8dabc1010d540542eea1d620540 /kernel/irq/proc.c
parent1fa744e6e91a895750b9980d13fcfc5791a0cd91 (diff)
[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>
Diffstat (limited to 'kernel/irq/proc.c')
-rw-r--r--kernel/irq/proc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index f26e534c658..8a64a4844cd 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -68,7 +68,9 @@ static int irq_affinity_write_proc(struct file *file, const char __user *buffer,
*/
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);