net: socket: add __sys_socketpair() helper; remove in-kernel call to syscall
Using the net-internal helper __sys_socketpair() allows us to avoid the
internal calls to the sys_socketpair() syscall.
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/net/socket.c b/net/socket.c
index 007fb94..5861821 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1368,8 +1368,7 @@ SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol)
* Create a pair of connected sockets.
*/
-SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
- int __user *, usockvec)
+int __sys_socketpair(int family, int type, int protocol, int __user *usockvec)
{
struct socket *sock1, *sock2;
int fd1, fd2, err;
@@ -1454,6 +1453,12 @@ SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
return err;
}
+SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
+ int __user *, usockvec)
+{
+ return __sys_socketpair(family, type, protocol, usockvec);
+}
+
/*
* Bind a name to a socket. Nothing much to do here since it's
* the protocol's responsibility to handle the local address.
@@ -2521,7 +2526,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
(int __user *)a[2]);
break;
case SYS_SOCKETPAIR:
- err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
+ err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]);
break;
case SYS_SEND:
err = sys_send(a0, (void __user *)a1, a[2], a[3]);
