tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 4238b1710eadd18dd16de0288a2bc5bb84614b4e commit: b1b3e4b16c4801379ba4d9c8807dc78bd0e40f2b [186/12271] kallsyms: Increase maximum kernel symbol length to 512 config: powerpc-randconfig-r004-20210622 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project b259740801d3515810ecc15bf0c24b0d476a1608) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout b1b3e4b16c4801379ba4d9c8807dc78bd0e40f2b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): In file included from kernel/trace/trace_events_hist.c:8: In file included from include/linux/module.h:12: In file included from include/linux/list.h:9: In file included from include/linux/kernel.h:11: In file included from include/linux/bitops.h:32: In file included from arch/powerpc/include/asm/bitops.h:62: arch/powerpc/include/asm/barrier.h:49:9: warning: '__lwsync' macro redefined [-Wmacro-redefined] #define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory") ^ <built-in>:309:9: note: previous definition is here #define __lwsync __builtin_ppc_lwsync ^ kernel/trace/trace_events_hist.c:5200:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] int ret; ^ static void hist_trigger_print_key(struct seq_file *m, ^ 3 warnings generated. vim +/hist_trigger_print_key +4566 kernel/trace/trace_events_hist.c 69a0200c2e25d6 Tom Zanussi 2016-03-03 4565 a3785b7eca8fd4 Tom Zanussi 2019-02-13 @4566 static void hist_trigger_print_key(struct seq_file *m, a3785b7eca8fd4 Tom Zanussi 2019-02-13 4567 struct hist_trigger_data *hist_data, a3785b7eca8fd4 Tom Zanussi 2019-02-13 4568 void *key, 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4569 struct tracing_map_elt *elt) 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4570 { 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4571 struct hist_field *key_field; c6afad49d127f6 Tom Zanussi 2016-03-03 4572 char str[KSYM_SYMBOL_LEN]; 69a0200c2e25d6 Tom Zanussi 2016-03-03 4573 bool multiline = false; 85013256cf0162 Tom Zanussi 2017-09-22 4574 const char *field_name; 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4575 unsigned int i; 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4576 u64 uval; 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4577 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4578 seq_puts(m, "{ "); 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4579 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4580 for_each_hist_key_field(i, hist_data) { 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4581 key_field = hist_data->fields[i]; 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4582 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4583 if (i > hist_data->n_vals) 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4584 seq_puts(m, ", "); 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4585 85013256cf0162 Tom Zanussi 2017-09-22 4586 field_name = hist_field_name(key_field, 0); 85013256cf0162 Tom Zanussi 2017-09-22 4587 0c4a6b4666e8eb Tom Zanussi 2016-03-03 4588 if (key_field->flags & HIST_FIELD_FL_HEX) { 0c4a6b4666e8eb Tom Zanussi 2016-03-03 4589 uval = *(u64 *)(key + key_field->offset); 85013256cf0162 Tom Zanussi 2017-09-22 4590 seq_printf(m, "%s: %llx", field_name, uval); c6afad49d127f6 Tom Zanussi 2016-03-03 4591 } else if (key_field->flags & HIST_FIELD_FL_SYM) { c6afad49d127f6 Tom Zanussi 2016-03-03 4592 uval = *(u64 *)(key + key_field->offset); c6afad49d127f6 Tom Zanussi 2016-03-03 4593 sprint_symbol_no_offset(str, uval); 85013256cf0162 Tom Zanussi 2017-09-22 4594 seq_printf(m, "%s: [%llx] %-45s", field_name, 85013256cf0162 Tom Zanussi 2017-09-22 4595 uval, str); c6afad49d127f6 Tom Zanussi 2016-03-03 4596 } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) { c6afad49d127f6 Tom Zanussi 2016-03-03 4597 uval = *(u64 *)(key + key_field->offset); c6afad49d127f6 Tom Zanussi 2016-03-03 4598 sprint_symbol(str, uval); 85013256cf0162 Tom Zanussi 2017-09-22 4599 seq_printf(m, "%s: [%llx] %-55s", field_name, 85013256cf0162 Tom Zanussi 2017-09-22 4600 uval, str); 6b4827ad028a1a Tom Zanussi 2016-03-03 4601 } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) { af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4602 struct hist_elt_data *elt_data = elt->private_data; af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4603 char *comm; af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4604 af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4605 if (WARN_ON_ONCE(!elt_data)) af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4606 return; af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4607 af6a29bcaf8ff2 Tom Zanussi 2018-01-15 4608 comm = elt_data->comm; 6b4827ad028a1a Tom Zanussi 2016-03-03 4609 6b4827ad028a1a Tom Zanussi 2016-03-03 4610 uval = *(u64 *)(key + key_field->offset); 85013256cf0162 Tom Zanussi 2017-09-22 4611 seq_printf(m, "%s: %-16s[%10llu]", field_name, 85013256cf0162 Tom Zanussi 2017-09-22 4612 comm, uval); 316961988b5ec7 Tom Zanussi 2016-03-03 4613 } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) { 316961988b5ec7 Tom Zanussi 2016-03-03 4614 const char *syscall_name; 316961988b5ec7 Tom Zanussi 2016-03-03 4615 316961988b5ec7 Tom Zanussi 2016-03-03 4616 uval = *(u64 *)(key + key_field->offset); 316961988b5ec7 Tom Zanussi 2016-03-03 4617 syscall_name = get_syscall_name(uval); 316961988b5ec7 Tom Zanussi 2016-03-03 4618 if (!syscall_name) 316961988b5ec7 Tom Zanussi 2016-03-03 4619 syscall_name = "unknown_syscall"; 316961988b5ec7 Tom Zanussi 2016-03-03 4620 85013256cf0162 Tom Zanussi 2017-09-22 4621 seq_printf(m, "%s: %-30s[%3llu]", field_name, 85013256cf0162 Tom Zanussi 2017-09-22 4622 syscall_name, uval); 69a0200c2e25d6 Tom Zanussi 2016-03-03 4623 } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) { 69a0200c2e25d6 Tom Zanussi 2016-03-03 4624 seq_puts(m, "stacktrace:\n"); 69a0200c2e25d6 Tom Zanussi 2016-03-03 4625 hist_trigger_stacktrace_print(m, 69a0200c2e25d6 Tom Zanussi 2016-03-03 4626 key + key_field->offset, 69a0200c2e25d6 Tom Zanussi 2016-03-03 4627 HIST_STACKTRACE_DEPTH); 69a0200c2e25d6 Tom Zanussi 2016-03-03 4628 multiline = true; 4b94f5b7b4a5ff Namhyung Kim 2016-03-03 4629 } else if (key_field->flags & HIST_FIELD_FL_LOG2) { 85013256cf0162 Tom Zanussi 2017-09-22 4630 seq_printf(m, "%s: ~ 2^%-2llu", field_name, 4b94f5b7b4a5ff Namhyung Kim 2016-03-03 4631 *(u64 *)(key + key_field->offset)); 0c4a6b4666e8eb Tom Zanussi 2016-03-03 4632 } else if (key_field->flags & HIST_FIELD_FL_STRING) { 85013256cf0162 Tom Zanussi 2017-09-22 4633 seq_printf(m, "%s: %-50s", field_name, 76a3b0c8ac344e Tom Zanussi 2016-03-03 4634 (char *)(key + key_field->offset)); 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4635 } else { 76a3b0c8ac344e Tom Zanussi 2016-03-03 4636 uval = *(u64 *)(key + key_field->offset); 85013256cf0162 Tom Zanussi 2017-09-22 4637 seq_printf(m, "%s: %10llu", field_name, uval); 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4638 } 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4639 } 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4640 69a0200c2e25d6 Tom Zanussi 2016-03-03 4641 if (!multiline) 69a0200c2e25d6 Tom Zanussi 2016-03-03 4642 seq_puts(m, " "); 69a0200c2e25d6 Tom Zanussi 2016-03-03 4643 7ef224d1d0e3a1 Tom Zanussi 2016-03-03 4644 seq_puts(m, "}"); a3785b7eca8fd4 Tom Zanussi 2019-02-13 4645 } a3785b7eca8fd4 Tom Zanussi 2019-02-13 4646 :::::: The code at line 4566 was first introduced by commit :::::: a3785b7eca8fd45c7c39f2ddfcd67368af30c1b4 tracing: Add hist trigger snapshot() action :::::: TO: Tom Zanussi <tom.zanussi(a)linux.intel.com&gt; :::::: CC: Steven Rostedt (VMware) <rostedt(a)goodmis.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org