CHECK: extern prototypes should be avoided in .h files #27: FILE: include/linux/socket.h:452: +extern int __sys_listen_socket(struct socket *sock, int backlog); total: 0 errors, 0 warnings, 1 checks, 44 lines checked NOTE: For some of the reported defects, checkpatch may be able to mechanically convert to the typical style using --fix or --fix-inplace. Commit ded3549b884f ("net: Split a __sys_listen helper for io_uring") has style problems, please review. NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF NOTE: If any of the errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS. total: 0 errors, 0 warnings, 1 checks, 44 lines checked