Hi Steven, kernel test robot noticed the following build warnings:
[auto build test WARNING on trace/for-next] [also build test WARNING on linus/master v6.15-rc4 next-20250502] [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/Steven-Rostedt/tracing-mmiotrace-Remove-reference-to-unused-per-CPU-data-pointer/20250503-050317 base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next patch link: https://lore.kernel.org/r/20250502205348.643055437%40goodmis.org patch subject: [PATCH 05/12] tracing: kdb: Use tracer_tracing_on/off() instead of setting per CPU disabled config: arc-randconfig-002-20250503 (https://download.01.org/0day-ci/archive/20250505/[email protected]/config) compiler: arc-linux-gcc (GCC) 11.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250505/[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 warnings (new ones prefixed by >>): kernel/trace/trace_kdb.c: In function 'kdb_ftdump': >> kernel/trace/trace_kdb.c:101:13: warning: unused variable 'cpu' >> [-Wunused-variable] 101 | int cpu; | ^~~ vim +/cpu +101 kernel/trace/trace_kdb.c 955b61e5979847 Jason Wessel 2010-08-05 91 955b61e5979847 Jason Wessel 2010-08-05 92 /* 955b61e5979847 Jason Wessel 2010-08-05 93 * kdb_ftdump - Dump the ftrace log buffer 955b61e5979847 Jason Wessel 2010-08-05 94 */ 955b61e5979847 Jason Wessel 2010-08-05 95 static int kdb_ftdump(int argc, const char **argv) 955b61e5979847 Jason Wessel 2010-08-05 96 { dbfe67334a1767 Douglas Anderson 2019-03-19 97 int skip_entries = 0; 19063c776fe745 Jason Wessel 2010-08-05 98 long cpu_file; 0c10cc2435115c Yuran Pereira 2024-10-28 99 int err; 03197fc02b3566 Douglas Anderson 2019-03-19 100 int cnt; 03197fc02b3566 Douglas Anderson 2019-03-19 @101 int cpu; 955b61e5979847 Jason Wessel 2010-08-05 102 19063c776fe745 Jason Wessel 2010-08-05 103 if (argc > 2) 955b61e5979847 Jason Wessel 2010-08-05 104 return KDB_ARGCOUNT; 955b61e5979847 Jason Wessel 2010-08-05 105 0c10cc2435115c Yuran Pereira 2024-10-28 106 if (argc && kstrtoint(argv[1], 0, &skip_entries)) 0c10cc2435115c Yuran Pereira 2024-10-28 107 return KDB_BADINT; 955b61e5979847 Jason Wessel 2010-08-05 108 19063c776fe745 Jason Wessel 2010-08-05 109 if (argc == 2) { 0c10cc2435115c Yuran Pereira 2024-10-28 110 err = kstrtol(argv[2], 0, &cpu_file); 0c10cc2435115c Yuran Pereira 2024-10-28 111 if (err || cpu_file >= NR_CPUS || cpu_file < 0 || 19063c776fe745 Jason Wessel 2010-08-05 112 !cpu_online(cpu_file)) 19063c776fe745 Jason Wessel 2010-08-05 113 return KDB_BADINT; 19063c776fe745 Jason Wessel 2010-08-05 114 } else { ae3b5093ad6004 Steven Rostedt 2013-01-23 115 cpu_file = RING_BUFFER_ALL_CPUS; 19063c776fe745 Jason Wessel 2010-08-05 116 } 19063c776fe745 Jason Wessel 2010-08-05 117 955b61e5979847 Jason Wessel 2010-08-05 118 kdb_trap_printk++; 03197fc02b3566 Douglas Anderson 2019-03-19 119 03197fc02b3566 Douglas Anderson 2019-03-19 120 trace_init_global_iter(&iter); 03197fc02b3566 Douglas Anderson 2019-03-19 121 iter.buffer_iter = buffer_iter; 03197fc02b3566 Douglas Anderson 2019-03-19 122 6a4611f6bb763d Steven Rostedt 2025-05-02 123 tracer_tracing_off(iter.tr); 03197fc02b3566 Douglas Anderson 2019-03-19 124 03197fc02b3566 Douglas Anderson 2019-03-19 125 /* A negative skip_entries means skip all but the last entries */ 03197fc02b3566 Douglas Anderson 2019-03-19 126 if (skip_entries < 0) { 03197fc02b3566 Douglas Anderson 2019-03-19 127 if (cpu_file == RING_BUFFER_ALL_CPUS) 03197fc02b3566 Douglas Anderson 2019-03-19 128 cnt = trace_total_entries(NULL); 03197fc02b3566 Douglas Anderson 2019-03-19 129 else 03197fc02b3566 Douglas Anderson 2019-03-19 130 cnt = trace_total_entries_cpu(NULL, cpu_file); 03197fc02b3566 Douglas Anderson 2019-03-19 131 skip_entries = max(cnt + skip_entries, 0); 03197fc02b3566 Douglas Anderson 2019-03-19 132 } 03197fc02b3566 Douglas Anderson 2019-03-19 133 dbfe67334a1767 Douglas Anderson 2019-03-19 134 ftrace_dump_buf(skip_entries, cpu_file); 03197fc02b3566 Douglas Anderson 2019-03-19 135 6a4611f6bb763d Steven Rostedt 2025-05-02 136 tracer_tracing_on(iter.tr); 03197fc02b3566 Douglas Anderson 2019-03-19 137 955b61e5979847 Jason Wessel 2010-08-05 138 kdb_trap_printk--; 955b61e5979847 Jason Wessel 2010-08-05 139 955b61e5979847 Jason Wessel 2010-08-05 140 return 0; 955b61e5979847 Jason Wessel 2010-08-05 141 } 955b61e5979847 Jason Wessel 2010-08-05 142 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
