+/*
+ * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+ *
+ * wrapper around irq_to_desc. Using KALLSYMS to get its address when
+ * available, else we need to have a kernel that exports this function to GPL
+ * modules.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
+ */
+
+#ifdef CONFIG_KALLSYMS
+
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+#include <linux/irqnr.h>
+#include "kallsyms.h"
+#include "irqdesc.h"
+
+static
+struct irq_desc *(*irq_to_desc_sym)(unsigned int irq);
+
+struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
+{
+ if (!irq_to_desc_sym)
+ irq_to_desc_sym = (void *) kallsyms_lookup_funcptr("irq_to_desc");
+ if (irq_to_desc_sym) {
+ return irq_to_desc_sym(irq);
+ } else {
+ printk(KERN_WARNING "LTTng: irq_to_desc symbol lookup failed.\n");
+ return NULL;
+ }
+}
+
+#else
+
+#include <linux/interrupt.h>
+#include <linux/irqnr.h>
+
+struct irq_desc *wrapper_irq_to_desc(unsigned int irq)
+{
+ return irq_to_desc(irq);
+}
+
+#endif