tree: https://github.com/ojeda/linux.git rust-printk head: eba4842a424c186b12e3e52d602738e503a30222 commit: 7c6155bc5ecf03cd24eb82ed6d2b6b5269cf750c [72/140] Use `rustc` directly instead of `cargo` config: powerpc64-randconfig-r024-20210317 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8ef111222a3dd12a9175f69c3bff598c46e8bdf7) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/ojeda/linux/commit/7c6155bc5ecf03cd24eb82ed6d2b6b5269c... git remote add ojeda-linux https://github.com/ojeda/linux.git git fetch --no-tags ojeda-linux rust-printk git checkout 7c6155bc5ecf03cd24eb82ed6d2b6b5269cf750c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static int hist_show(struct seq_file *m, void *v) ^ 1 warning generated. vim +/hist_show +4729 kernel/trace/trace_events_hist.c 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4728 52a7f16dedff8f2 Tom Zanussi 2016-03-03 @4729 static int hist_show(struct seq_file *m, void *v) 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4730 { 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4731 struct event_trigger_data *data; 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4732 struct trace_event_file *event_file; 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4733 int n = 0, ret = 0; 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4734 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4735 mutex_lock(&event_mutex); 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4736 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4737 event_file = event_file_data(m->private); 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4738 if (unlikely(!event_file)) { 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4739 ret = -ENODEV; 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4740 goto out_unlock; 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4741 } 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4742 aeed8aa3874dc15 Masami Hiramatsu 2019-12-20 4743 list_for_each_entry(data, &event_file->triggers, list) { 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4744 if (data->cmd_ops->trigger_type == ETT_EVENT_HIST) 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4745 hist_trigger_show(m, data, n++); 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4746 } 52a7f16dedff8f2 Tom Zanussi 2016-03-03 4747 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4748 out_unlock: 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4749 mutex_unlock(&event_mutex); 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4750 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4751 return ret; 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4752 } 7ef224d1d0e3a1a Tom Zanussi 2016-03-03 4753 :::::: The code at line 4729 was first introduced by commit :::::: 52a7f16dedff8f23d03df3ea556dec95b92a5801 tracing: Add support for multiple hist triggers per event :::::: TO: Tom Zanussi <tom.zanussi(a)linux.intel.com&gt; :::::: CC: Steven Rostedt <rostedt(a)goodmis.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org