-/*
- * Copyright (C) 2011 Mathieu Desnoyers (mathieu.desnoyers@efficios.com)
+/* 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.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*/
-#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>
#include <linux/splice.h>
-#include "kallsyms.h"
+#include <wrapper/kallsyms.h>
static
ssize_t (*splice_to_pipe_sym)(struct pipe_inode_info *pipe,
if (splice_to_pipe_sym) {
return splice_to_pipe_sym(pipe, spd);
} else {
- printk(KERN_WARNING "LTTng: splice_to_pipe symbol lookup failed.\n");
+ printk_once(KERN_WARNING "LTTng: splice_to_pipe symbol lookup failed.\n");
return -ENOSYS;
}
}
+/*
+ * 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>