[kbuild-all] Re: [mptcp:export 24/34] net/mptcp/sockopt.c:1174:12: error: redefinition of 'mptcp_getsockopt_v4'

tree: https://github.com/multipath-tcp/mptcp_net-next.git export head: 8d79e486d97bbdec3af4cf2f19d91fec433d437b commit: 48c617e1584b3190eb02338f4ef77807f433e579 [24/34] mptcp: getsockopt: add support for IP_TOS config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20211208/202112081738.D1IpgkU6-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/multipath-tcp/mptcp_net-next/commit/48c617e1584b3190eb... git remote add mptcp https://github.com/multipath-tcp/mptcp_net-next.git git fetch --no-tags mptcp export git checkout 48c617e1584b3190eb02338f4ef77807f433e579 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): >> net/mptcp/sockopt.c:1174:12: error: redefinition of 'mptcp_getsockopt_v4' 1174 | static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, | ^~~~~~~~~~~~~~~~~~~ net/mptcp/sockopt.c:1161:12: note: previous definition of 'mptcp_getsockopt_v4' was here 1161 | static int mptcp_getsockopt_v4(struct mptcp_sock *msk, int optname, | ^~~~~~~~~~~~~~~~~~~ net/mptcp/sockopt.c:1161:12: warning: 'mptcp_getsockopt_v4' defined but not used [-Wunused-function]