Using the net-internal helper __sys_setsockopt() allows us to avoid the internal calls to the sys_setsockopt() 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.ga17...@light.dominikbrodowski.net Cc: David S. Miller <da...@davemloft.net> Cc: net...@vger.kernel.org Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net> --- include/linux/socket.h | 1 + net/socket.c | 13 ++++++++++--- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/include/linux/socket.h b/include/linux/socket.h index b205138b69f1..cad120e4ed4b 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -376,4 +376,5 @@ extern int __sys_socketpair(int family, int type, int protocol, int __user *usockvec); extern int __sys_shutdown(int fd, int how); + #endif /* _LINUX_SOCKET_H */ diff --git a/net/socket.c b/net/socket.c index ad5dfd6a1d59..5dd2e39a6cd4 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1878,8 +1878,8 @@ SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, * to pass the user mode parameter for the protocols to sort out. */ -SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, - char __user *, optval, int, optlen) +static int __sys_setsockopt(int fd, int level, int optname, + char __user *optval, int optlen) { int err, fput_needed; struct socket *sock; @@ -1907,6 +1907,12 @@ SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, return err; } +SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, + char __user *, optval, int, optlen) +{ + return __sys_setsockopt(fd, level, optname, optval, optlen); +} + /* * Get a socket option. Because we don't know the option lengths we have * to pass a user mode parameter for the protocols to sort out. @@ -2552,7 +2558,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) err = __sys_shutdown(a0, a1); break; case SYS_SETSOCKOPT: - err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); + err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], + a[4]); break; case SYS_GETSOCKOPT: err = -- 2.16.3
