-#ifndef _LTTNG_WRAPPER_GENHD_H
-#define _LTTNG_WRAPPER_GENHD_H
-
-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* wrapper/genhd.h
*
* wrapper around block layer functions and data structures. Using
* kernel that exports this function to GPL modules.
*
* Copyright (C) 2011-2014 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_GENHD_H
+#define _LTTNG_WRAPPER_GENHD_H
+
#include <linux/genhd.h>
-#ifdef CONFIG_KALLSYMS
+#ifdef CONFIG_KALLSYMS_ALL
#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
-static inline
-char *wrapper_disk_name(struct gendisk *hd, int partno, char *buf)
-{
- char *(*disk_name_sym)(struct gendisk *hd, int partno, char *buf);
-
- disk_name_sym = (void *) kallsyms_lookup_funcptr("disk_name");
- if (disk_name_sym) {
- return disk_name_sym(hd, partno, buf);
- } else {
- printk_once(KERN_WARNING "LTTng: disk_name symbol lookup failed.\n");
- return NULL;
- }
-}
-
-#else
-
-static inline
-char *wrapper_disk_name(struct gendisk *hd, int partno, char *buf)
-{
- return disk_name(hd, partno, buf);
-}
-
-#endif
-
-#ifdef CONFIG_KALLSYMS_ALL
-
static inline
struct class *wrapper_get_block_class(void)
{
return ptr_block_class;
}
+/*
+ * Canary function to check for 'block_class' at compile time.
+ *
+ * From 'include/linux/genhd.h':
+ *
+ * extern struct class block_class;
+ */
+static inline
+struct class *__canary__get_block_class(void)
+{
+ return &block_class;
+}
+
static inline
struct device_type *wrapper_get_disk_type(void)
{
return ptr_disk_type;
}
+/*
+ * No canary for 'disk_type', it's only defined in 'block/genhd.c'.
+ *
+ * static inline
+ * struct device_type *__canary__get_disk_type(void)
+ * {
+ * return &disk_type;
+ * }
+ */
+
#else
static inline