Compile out splice support from socket when the splice-family of syscalls is not
supported by the system (i.e. CONFIG_SYSCALL_SPLICE is undefined).

Signed-off-by: Pieter Smith <pie...@boesman.nl>
---
 net/socket.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 95ee7d8..5cb347a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -155,8 +155,8 @@ static const struct file_operations socket_file_ops = {
        .release =      sock_close,
        .fasync =       sock_fasync,
        .sendpage =     sock_sendpage,
-       .splice_write = generic_splice_sendpage,
-       .splice_read =  sock_splice_read,
+       SPLICE_WRITE_INIT(generic_splice_sendpage)
+       SPLICE_READ_INIT(sock_splice_read)
 };
 
 /*
@@ -881,7 +881,8 @@ static ssize_t sock_sendpage(struct file *file, struct page 
*page,
        return kernel_sendpage(sock, page, offset, size, flags);
 }
 
-static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
+static ssize_t __maybe_unused sock_splice_read(
+                               struct file *file, loff_t *ppos,
                                struct pipe_inode_info *pipe, size_t len,
                                unsigned int flags)
 {
-- 
1.9.1

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