[PATCH] Fix xics IRQ affinity

From: Anton Blanchard <anton@samba.org>

- Merge some whitespace differences with the ameslab tree
- We check for CPU_MASK_ALL in xics to send irqs to all cpus.
  In some cases CPU_MASK_ALL is smaller than the cpumask (eg
  NR_CPUS == 32 and cpumask is a long), so we mask it here to
  be consistent.

arch/ppc64/kernel/irq.c

@@ -183,6 +183,7 @@ do_free_irq(int irq, void* dev_id)
 	return -ENOENT;
 }
 
+
 int request_irq(unsigned int irq,
 	irqreturn_t (*handler)(int, void *, struct pt_regs *),
 	unsigned long irqflags, const char * devname, void *dev_id)
@@ -699,6 +700,7 @@ static int irq_affinity_write_proc (struct file *file, const char *buffer,
 {
 	int irq = (long)data, full_count = count, err;
 	cpumask_t new_value, tmp;
+	cpumask_t allcpus = CPU_MASK_ALL;
 
 	if (!irq_desc[irq].handler->set_affinity)
 		return -EIO;
@@ -707,6 +709,14 @@ static int irq_affinity_write_proc (struct file *file, const char *buffer,
 	if (err)
 		return err;
 
+	/*
+	 * We check for CPU_MASK_ALL in xics to send irqs to all cpus.
+	 * In some cases CPU_MASK_ALL is smaller than the cpumask (eg
+	 * NR_CPUS == 32 and cpumask is a long), so we mask it here to
+	 * be consistent.
+	 */
+	cpus_and(new_value, new_value, allcpus);
+
 	/*
 	 * Do not allow disabling IRQs completely - it's a too easy
 	 * way to make the system unusable accidentally :-) At least