-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* wrapper/splice.c
*
* wrapper around splice_to_pipe. Using KALLSYMS to get its address when
* available, else we need to have a kernel that exports this function to GPL
- * modules.
+ * modules. The export was introduced in kernel 4.2.
*
* 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
*/
-#ifdef CONFIG_KALLSYMS
+#include <lttng-kernel-version.h>
+
+#if (defined(CONFIG_KALLSYMS) \
+ && (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,2,0)))
#include <linux/kallsyms.h>
#include <linux/fs.h>
}
}
+/*
+ * Canary function to check for 'splice_to_pipe()' at compile time.
+ *
+ * From 'include/linux/splice.h':
+ *
+ * extern ssize_t splice_to_pipe(struct pipe_inode_info *,
+ * struct splice_pipe_desc *spd);
+ */
+__attribute__((unused)) static
+ssize_t __canary__splice_to_pipe(struct pipe_inode_info *pipe,
+ struct splice_pipe_desc *spd)
+{
+ return splice_to_pipe(pipe, spd);
+}
+
#else
#include <linux/fs.h>