parisc: convert cpu_check_affinity to new cpumask api

cpumask arg to the affinity function is now const, sort
that out through the irq_desc implementations.
Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

arch/parisc/include/asm/irq.h

@@ -49,7 +49,7 @@ extern unsigned long txn_alloc_addr(unsigned int);
 extern unsigned long txn_affinity_addr(unsigned int irq, int cpu);
 
 extern int cpu_claim_irq(unsigned int irq, struct irq_chip *, void *);
-extern int cpu_check_affinity(unsigned int irq, cpumask_t *dest);
+extern int cpu_check_affinity(unsigned int irq, const struct cpumask *dest);
 
 /* soft power switch support (power.c) */
 extern struct tasklet_struct power_tasklet;

arch/parisc/kernel/irq.c

@@ -112,7 +112,7 @@ void cpu_end_irq(unsigned int irq)
 }
 
 #ifdef CONFIG_SMP
-int cpu_check_affinity(unsigned int irq, cpumask_t *dest)
+int cpu_check_affinity(unsigned int irq, const struct cpumask *dest)
 {
 	int cpu_dest;
 
@@ -126,17 +126,19 @@ int cpu_check_affinity(unsigned int irq, cpumask_t *dest)
 
 	/* whatever mask they set, we just allow one CPU */
 	cpu_dest = first_cpu(*dest);
-	*dest = cpumask_of_cpu(cpu_dest);
 
-	return 0;
+	return cpu_dest;
 }
 
 static void cpu_set_affinity_irq(unsigned int irq, const struct cpumask *dest)
 {
-	if (cpu_check_affinity(irq, dest))
+	int cpu_dest;
+
+	cpu_dest = cpu_check_affinity(irq, dest);
+	if (cpu_dest < 0)
 		return;
 
-	cpumask_copy(&irq_desc[irq].affinity, dest);
+	cpumask_copy(&irq_desc[irq].affinity, &cpumask_of_cpu(cpu_dest));
 }
 #endif
 

drivers/parisc/iosapic.c

@@ -708,11 +708,14 @@ static void iosapic_set_affinity_irq(unsigned int irq,
 	struct vector_info *vi = iosapic_get_vector(irq);
 	u32 d0, d1, dummy_d0;
 	unsigned long flags;
+	int dest_cpu;
 
-	if (cpu_check_affinity(irq, dest))
+	dest_cpu = cpu_check_affinity(irq, dest);
+	if (dest_cpu < 0)
 		return;
 
-	vi->txn_addr = txn_affinity_addr(irq, cpumask_first(dest));
+	irq_desc[irq].affinity = cpumask_of_cpu(dest_cpu);
+	vi->txn_addr = txn_affinity_addr(irq, dest_cpu);
 
 	spin_lock_irqsave(&iosapic_lock, flags);
 	/* d1 contains the destination CPU, so only want to set that