[PATCH -next 13/22] net: socket: add __sys_getsockopt() helper; remove in-kernel call to syscall

[Dominik Brodowski]

Using the net-internal helper __sys_getsockopt() allows us to avoid the
internal calls to the sys_getsockopt() syscall.

Cc: David S. Miller <da...@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net>
---
 net/socket.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 5dd2e39a6cd4..a05289b1f863 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1918,8 +1918,8 @@ SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, 
optname,
  *     to pass a user mode parameter for the protocols to sort out.
  */
 
-SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
-               char __user *, optval, int __user *, optlen)
+static int __sys_getsockopt(int fd, int level, int optname,
+                           char __user *optval, int __user *optlen)
 {
        int err, fput_needed;
        struct socket *sock;
@@ -1944,6 +1944,12 @@ SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, 
optname,
        return err;
 }
 
+SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname,
+               char __user *, optval, int __user *, optlen)
+{
+       return __sys_getsockopt(fd, level, optname, optval, optlen);
+}
+
 /*
  *     Shutdown a socket.
  */
@@ -2563,8 +2569,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long 
__user *, args)
                break;
        case SYS_GETSOCKOPT:
                err =
-                   sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
-                                  (int __user *)a[4]);
+                   __sys_getsockopt(a0, a1, a[2], (char __user *)a[3],
+                                    (int __user *)a[4]);
                break;
        case SYS_SENDMSG:
                err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
-- 
2.16.2