[PATCH] genirq: Add single IRQ reservation helper.

[Paul Mundt <lethal@linux-sh.org>]

For cases that wish to reserve a single IRQ simply provide a wrapper in
to the ranged reservation routine.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

---

I picked irq_reserve_irq() to follow the irq_alloc_descs/desc naming
scheme, but perhaps irq_reserve() or irq_reserve_at() is less visually
offensive? Feel free to mangle away as necessary :-)

 include/linux/irq.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index e963911..abde252 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -412,6 +412,11 @@ static inline void irq_free_desc(unsigned int irq)
 	irq_free_descs(irq, 1);
 }
 
+static inline int irq_reserve_irq(unsigned int irq)
+{
+	return irq_reserve_irqs(irq, 1);
+}
+
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #endif /* !CONFIG_S390 */