irq: add irq_desc_without_new
add an irq_desc accessor that will not allocate any sparse entry
but returns failure if there's no entry present.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/irq.h b/include/linux/irq.h
index cbf471a..c9ffef7 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -191,10 +191,23 @@
} ____cacheline_internodealigned_in_smp;
extern struct irq_desc *irq_to_desc(unsigned int irq);
+extern struct irq_desc *__irq_to_desc(unsigned int irq);
+
+#ifndef CONFIG_HAVE_SPARSE_IRQ
+
#ifndef CONFIG_HAVE_DYN_ARRAY
/* could be removed if we get rid of all irq_desc reference */
extern struct irq_desc irq_desc[NR_IRQS];
+#else
+extern struct irq_desc *irq_desc;
#endif
+
+#else
+
+extern struct irq_desc *sparse_irqs;
+
+#endif
+
#define kstat_irqs_this_cpu(DESC) \
((DESC)->kstat_irqs[smp_processor_id()])