Documentation/.renames.txt: warning: ignored by one of the .gitignore files ../net/socket.c:1735:21: warning: symbol 'update_socket_protocol' was not declared. Should it be static? ../drivers/vhost/net.c:1395:37: warning: Using plain integer as NULL pointer ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static? Documentation/.renames.txt: warning: ignored by one of the .gitignore files ../net/socket.c:1735:21: warning: symbol 'update_socket_protocol' was not declared. Should it be static? ../drivers/vhost/net.c:1395:37: warning: Using plain integer as NULL pointer ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static?