[kbuild-all] [hch-misc:kernel_setsockopt 10/32] net/core/sock.c:807:6: warning: no previous prototype for '__sock_set_rcvbuf'

tree: git://git.infradead.org/users/hch/misc.git kernel_setsockopt head: 43d0f0870df329db68ecbae8e699615ff0c009f1 commit: 14a156d7bffb7051e47cada85e62cbaccea7fd03 [10/32] net: add sock_set_rcvbuf config: nios2-defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 14a156d7bffb7051e47cada85e62cbaccea7fd03 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): 807 | void __sock_set_rcvbuf(struct sock *sk, int val) | ^~~~~~~~~~~~~~~~~ vim +/__sock_set_rcvbuf +807 net/core/sock.c 806 808 { 809 /* Ensure val * 2 fits into an int, to prevent max_t() from treating it 810 * as a negative value. 811 */ 812 val = min_t(int, val, INT_MAX / 2); 813 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 814 815 /* We double it on the way in to account for "struct sk_buff" etc. 816 * overhead. Applications assume that the SO_RCVBUF setting they make 817 * will allow that much actual data to be received on that socket. 818 * 819 * Applications are unaware that "struct sk_buff" and other overheads 820 * allocate from the receive buffer during socket buffer allocation. 821 * 822 * And after considering the possible alternatives, returning the value 823 * we actually used in getsockopt is the most desirable behavior. 824 */ 825 WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF)); 826 } 827 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org