Hi Masami, kernel test robot noticed the following build errors:
[auto build test ERROR on trace/for-next] [cannot apply to linus/master v7.1-rc1 next-20260430] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Masami-Hiramatsu-Google/fprobe-Add-unregister_fprobe_sync-for-synchronous-unregistration/20260427-214258 base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next patch link: https://lore.kernel.org/r/177729179863.401400.6063130067239479972.stgit%40mhiramat.tok.corp.google.com patch subject: [PATCH] fprobe: Add unregister_fprobe_sync() for synchronous unregistration config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20260503/[email protected]/config) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260503/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): >> kernel/trace/fprobe.c:983:14: error: call to undeclared function >> 'fprobe_registered'; ISO C99 and later do not support implicit function >> declarations [-Wimplicit-function-declaration] 983 | if (!fp || !fprobe_registered(fp)) | ^ >> kernel/trace/fprobe.c:986:8: error: call to undeclared function >> 'unregister_fprobe_nolock'; ISO C99 and later do not support implicit >> function declarations [-Wimplicit-function-declaration] 986 | ret = unregister_fprobe_nolock(fp); | ^ kernel/trace/fprobe.c:986:8: note: did you mean 'unregister_fprobe_sync'? kernel/trace/fprobe.c:978:5: note: 'unregister_fprobe_sync' declared here 978 | int unregister_fprobe_sync(struct fprobe *fp) | ^ 979 | { 980 | int ret; 981 | 982 | guard(mutex)(&fprobe_mutex); 983 | if (!fp || !fprobe_registered(fp)) 984 | return -EINVAL; 985 | 986 | ret = unregister_fprobe_nolock(fp); | ~~~~~~~~~~~~~~~~~~~~~~~~ | unregister_fprobe_sync 2 errors generated. vim +/fprobe_registered +983 kernel/trace/fprobe.c 967 968 /** 969 * unregister_fprobe_sync() - Unregister fprobe synchronously with RCU grace period. 970 * @fp: A fprobe data structure to be unregistered. 971 * 972 * Unregister fprobe (and remove ftrace hooks from the function entries) and 973 * wait for the RCU grace period to finish. This is useful for preventing 974 * the fprobe from being used after it is unregistered. 975 * 976 * Return 0 if @fp is unregistered successfully, -errno if not. 977 */ 978 int unregister_fprobe_sync(struct fprobe *fp) 979 { 980 int ret; 981 982 guard(mutex)(&fprobe_mutex); > 983 if (!fp || !fprobe_registered(fp)) 984 return -EINVAL; 985 > 986 ret = unregister_fprobe_nolock(fp); 987 if (ret) 988 return ret; 989 990 synchronize_rcu(); 991 return 0; 992 } 993 EXPORT_SYMBOL_GPL(unregister_fprobe_sync); 994 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
