Detect missing symbols used with kallsyms_lookup at compile time

[lttng-modules.git] / wrapper / irqdesc.h

diff --git a/wrapper/irqdesc.h b/wrapper/irqdesc.h
index d702de162c489ac88f49f743347f77a0927f67f8..ce7da2b481f36f59ec95e66e87273737a0f1e616 100644 (file)
--- a/wrapper/irqdesc.h
+++ b/wrapper/irqdesc.h
@@ -1,7 +1,5 @@
-#ifndef _LTTNG_WRAPPER_IRQDESC_H
-#define _LTTNG_WRAPPER_IRQDESC_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
  * wrapper/irqdesc.h
  *
  * wrapper around irq_to_desc. Using KALLSYMS to get its address when
@@ -9,25 +7,27 @@
  * modules.
  *
  * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef _LTTNG_WRAPPER_IRQDESC_H
+#define _LTTNG_WRAPPER_IRQDESC_H
+
 #include <linux/interrupt.h>
 #include <linux/irqnr.h>
 
 struct irq_desc *wrapper_irq_to_desc(unsigned int irq);
 
+/*
+ * Canary function to check for 'irq_to_desc()' at compile time.
+ *
+ * From 'include/linux/irqnr.h':
+ *
+ *   extern struct irq_desc *irq_to_desc(unsigned int irq);
+ */
+static inline
+struct irq_desc *__canary__irq_to_desc(unsigned int irq)
+{
+       return irq_to_desc(irq);
+}
+
 #endif /* _LTTNG_WRAPPER_IRQDESC_H */