[kbuild-all] kernel/trace/ftrace.c:7157:20: error: unused function 'ftrace_startup_enable'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: b81b1829e7e39f6cebdf6e4d5484eacbceda8554 commit: 172f7ba9772cae12f099fc563352e905dc9a1921 ftrace: Make ftrace_profile_pages_init static date: 4 months ago config: arm-randconfig-r001-20220213 (https://download.01.org/0day-ci/archive/20220213/202202132037.4aN017dU-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 478c237e21b2c3a83e46f26fcbeb3876682f9b14) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 172f7ba9772cae12f099fc563352e905dc9a1921 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/ kernel/trace/ 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 >>): static inline void ftrace_startup_enable(int command) { } ^ 1 error generated. vim +/ftrace_startup_enable +7157 kernel/trace/ftrace.c 0b6e4d56bf7186 Frederic Weisbecker 2008-10-28 7155 8434dc9340cd2e Steven Rostedt (Red Hat 2015-01-20 7156) static inline int ftrace_init_dyn_tracefs(struct dentry *d_tracer) { return 0; } df4fc31558dd2a Steven Rostedt 2008-11-26 @7157 static inline void ftrace_startup_enable(int command) { } e1effa0144a1dd Steven Rostedt (Red Hat 2014-08-05 7158) static inline void ftrace_startup_all(int command) { } 8a56d7761d2d04 Steven Rostedt (Red Hat 2013-11-25 7159) :::::: The code at line 7157 was first introduced by commit :::::: df4fc31558dd2a3a30292ddb3a64c2a5befcec73 ftrace: add function tracing to single thread :::::: TO: Steven Rostedt <srostedt(a)redhat.com&gt; :::::: CC: Ingo Molnar <mingo(a)elte.hu&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org