powerpc/pseries/xics: Use cpu_possible_mask rather than cpu_all_mask

Current firmware only allows us to send IRQs to the first processor or
all processors. We currently check to see if the passed in mask is equal
to the all_mask, but the firmware is only considering whether the
request is for the equivalent of the possible_mask. Thus, we think the
request is for some subset of CPUs and only assign IRQs to the first CPU
(on systems without irqbalance running) as evidenced by
/proc/interrupts. By using possible_mask instead, we account for this
and proper interleaving of interrupts occurs.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index 93834b0d8272231f5c9376784bc5e82bd98c9e38..7c1e3426888b7e17c4bc00ea9dad6a642d554cd3 100644 (file)
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -178,7 +178,7 @@ static int get_irq_server(unsigned int virq, const struct cpumask *cpumask,
        if (!distribute_irqs)
                return default_server;
 
-       if (!cpumask_equal(cpumask, cpu_all_mask)) {
+       if (!cpumask_subset(cpu_possible_mask, cpumask)) {
                int server = cpumask_first_and(cpu_online_mask, cpumask);
 
                if (server < nr_cpu_ids)