1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
5 * wrapper around splice_to_pipe. Using KALLSYMS to get its address when
6 * available, else we need to have a kernel that exports this function to GPL
7 * modules. The export was introduced in kernel 4.2.
9 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 #include <lttng/kernel-version.h>
14 #if (defined(CONFIG_KALLSYMS) \
15 && (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,2,0)))
17 #include <linux/kallsyms.h>
19 #include <linux/splice.h>
20 #include <wrapper/kallsyms.h>
23 ssize_t (*splice_to_pipe_sym
)(struct pipe_inode_info
*pipe
,
24 struct splice_pipe_desc
*spd
);
26 ssize_t
wrapper_splice_to_pipe(struct pipe_inode_info
*pipe
,
27 struct splice_pipe_desc
*spd
)
29 if (!splice_to_pipe_sym
)
30 splice_to_pipe_sym
= (void *) kallsyms_lookup_funcptr("splice_to_pipe");
31 if (splice_to_pipe_sym
) {
32 return splice_to_pipe_sym(pipe
, spd
);
34 printk_once(KERN_WARNING
"LTTng: splice_to_pipe symbol lookup failed.\n");
40 * Canary function to check for 'splice_to_pipe()' at compile time.
42 * From 'include/linux/splice.h':
44 * extern ssize_t splice_to_pipe(struct pipe_inode_info *,
45 * struct splice_pipe_desc *spd);
47 __attribute__((unused
)) static
48 ssize_t
__canary__splice_to_pipe(struct pipe_inode_info
*pipe
,
49 struct splice_pipe_desc
*spd
)
51 return splice_to_pipe(pipe
, spd
);
57 #include <linux/splice.h>
59 ssize_t
wrapper_splice_to_pipe(struct pipe_inode_info
*pipe
,
60 struct splice_pipe_desc
*spd
)
62 return splice_to_pipe(pipe
, spd
);
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