1 files changed, 11 insertions, 0 deletions

diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
index ce49c85c928f..b4c239685d2e 100644
--- a/arch/ia64/kernel/irq.c
+++ b/arch/ia64/kernel/irq.c
@@ -104,6 +104,17 @@ void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
                 irq_redir[irq] = (char) (redir & 0xff);
         }
 }
+
+bool is_affinity_mask_valid(cpumask_t cpumask)
+{
+        if (ia64_platform_is("sn2")) {
+                /* Only allow one CPU to be specified in the smp_affinity mask */
+                if (cpus_weight(cpumask) != 1)
+                        return false;
+        }
+        return true;
+}
+
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_HOTPLUG_CPU