genirq: Introduce helper function irq_data_get_affinity_mask()

Introduce helper function irq_data_get_affinity_mask() and
irq_get_affinity_mask() to hide implementation details,
so we could move field 'affinity' from struct irq_data into
struct irq_common_data later.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/1433145945-789-15-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

include/linux/irq.h

@@ -645,6 +645,18 @@ static inline int irq_data_get_node(struct irq_data *d)
 	return d->node;
 }
 
+static inline struct cpumask *irq_get_affinity_mask(int irq)
+{
+	struct irq_data *d = irq_get_irq_data(irq);
+
+	return d ? d->affinity : NULL;
+}
+
+static inline struct cpumask *irq_data_get_affinity_mask(struct irq_data *d)
+{
+	return d->affinity;
+}
+
 unsigned int arch_dynirq_lower_bound(unsigned int from);
 
 int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node,