* [mhiramat:topic/ring-buffer-bootid 4/4] kernel/trace/trace_selftest.c:1245:1: warning: 'trace_selftest_startup_preemptoff' defined but not used
@ 2026-05-21 17:46 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-05-21 17:46 UTC (permalink / raw)
To: Masami Hiramatsu (Google); +Cc: oe-kbuild-all
Hi Masami,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/ring-buffer-bootid
head: 11c7f327c260ca2dd626cb8e242b1aed41959caf
commit: 11c7f327c260ca2dd626cb8e242b1aed41959caf [4/4] tracing: Record and show boot ID in last_boot_info
config: parisc-randconfig-001-20260521 (https://download.01.org/0day-ci/archive/20260522/202605220156.JbrJrPyg-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260522/202605220156.JbrJrPyg-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605220156.JbrJrPyg-lkp@intel.com/
All warnings (new ones prefixed by >>):
9452 | static void ftrace_dump_by_param(void)
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9522:19: error: non-static declaration of 'ftrace_dump' follows static declaration
9522 | EXPORT_SYMBOL_GPL(ftrace_dump);
| ^~~~~~~~~~~
include/linux/export.h:76:28: note: in definition of macro '__EXPORT_SYMBOL'
76 | extern typeof(sym) sym; \
| ^~~
include/linux/export.h:90:41: note: in expansion of macro '_EXPORT_SYMBOL'
90 | #define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "GPL")
| ^~~~~~~~~~~~~~
kernel/trace/trace.c:9522:1: note: in expansion of macro 'EXPORT_SYMBOL_GPL'
9522 | EXPORT_SYMBOL_GPL(ftrace_dump);
| ^~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9493:6: note: previous definition of 'ftrace_dump' with type 'void(enum ftrace_dump_mode)'
9493 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)
| ^~~~~~~~~~~
kernel/trace/trace.c:9585:19: error: invalid storage class for function 'backup_instance_area'
9585 | __init static int backup_instance_area(const char *backup,
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9621:20: error: invalid storage class for function 'enable_instances'
9621 | __init static void enable_instances(void)
| ^~~~~~~~~~~~~~~~
kernel/trace/trace.c:9798:19: error: invalid storage class for function 'tracer_alloc_buffers'
9798 | __init static int tracer_alloc_buffers(void)
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9973:20: error: invalid storage class for function 'clear_boot_tracer'
9973 | __init static void clear_boot_tracer(void)
| ^~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9991:20: error: invalid storage class for function 'tracing_set_default_clock'
9991 | __init static void tracing_set_default_clock(void)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:10012:19: error: invalid storage class for function 'late_trace_init'
10012 | __init static int late_trace_init(void)
| ^~~~~~~~~~~~~~~
kernel/trace/trace.c:10027:20: error: initializer element is not constant
10027 | late_initcall_sync(late_trace_init);
| ^~~~~~~~~~~~~~~
include/linux/init.h:265:55: note: in definition of macro '____define_initcall'
265 | __attribute__((__section__(__sec))) = fn;
| ^~
include/linux/init.h:275:9: note: in expansion of macro '__unique_initcall'
275 | __unique_initcall(fn, id, __sec, __initcall_id(fn))
| ^~~~~~~~~~~~~~~~~
include/linux/init.h:277:35: note: in expansion of macro '___define_initcall'
277 | #define __define_initcall(fn, id) ___define_initcall(fn, id, .initcall##id)
| ^~~~~~~~~~~~~~~~~~
include/linux/init.h:309:41: note: in expansion of macro '__define_initcall'
309 | #define late_initcall_sync(fn) __define_initcall(fn, 7s)
| ^~~~~~~~~~~~~~~~~
kernel/trace/trace.c:10027:1: note: in expansion of macro 'late_initcall_sync'
10027 | late_initcall_sync(late_trace_init);
| ^~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:10027:1: error: expected declaration or statement at end of input
include/linux/delay.h:57:22: warning: unused variable 'lpj_fine' [-Wunused-variable]
57 | extern unsigned long lpj_fine;
| ^~~~~~~~
include/linux/delay.h:16:22: warning: unused variable 'loops_per_jiffy' [-Wunused-variable]
16 | extern unsigned long loops_per_jiffy;
| ^~~~~~~~~~~~~~~
kernel/trace/trace.c:6764:30: warning: unused variable 'trace_min_max_fops' [-Wunused-variable]
6764 | const struct file_operations trace_min_max_fops = {
| ^~~~~~~~~~~~~~~~~~
kernel/trace/trace.c: At top level:
kernel/trace/trace.c:1433:12: warning: 'add_tracer' used but never defined
1433 | static int add_tracer(struct trace_array *tr, struct tracer *t);
| ^~~~~~~~~~
kernel/trace/trace.c:9965:13: warning: 'trace_init' defined but not used [-Wunused-function]
9965 | void __init trace_init(void)
| ^~~~~~~~~~
kernel/trace/trace.c:9950:13: warning: 'early_trace_init' defined but not used [-Wunused-function]
9950 | void __init early_trace_init(void)
| ^~~~~~~~~~~~~~~~
kernel/trace/trace.c:9944:21: warning: 'trace_get_global_array' defined but not used [-Wunused-function]
9944 | struct trace_array *trace_get_global_array(void)
| ^~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9526:9: warning: 'trace_parse_run_command' defined but not used [-Wunused-function]
9526 | ssize_t trace_parse_run_command(struct file *file, const char __user *buffer,
| ^~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9360:6: warning: 'trace_init_global_iter' defined but not used [-Wunused-function]
9360 | void trace_init_global_iter(struct trace_iterator *iter)
| ^~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9284:12: warning: 'trace_die_panic_handler' defined but not used [-Wunused-function]
9284 | static int trace_die_panic_handler(struct notifier_block *self,
| ^~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:9098:6: warning: 'module_exists' defined but not used [-Wunused-function]
9098 | bool module_exists(const char *module)
| ^~~~~~~~~~~~~
kernel/trace/trace.c:8538:21: warning: 'trace_array_find_get' defined but not used [-Wunused-function]
8538 | struct trace_array *trace_array_find_get(const char *instance)
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_selftest.c:1538:1: warning: 'trace_selftest_startup_branch' defined but not used [-Wunused-function]
1538 | trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_selftest.c:1460:1: warning: 'trace_selftest_startup_wakeup' defined but not used [-Wunused-function]
1460 | trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_selftest.c:1408:1: warning: 'trace_selftest_startup_nop' defined but not used [-Wunused-function]
1408 | trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/trace_selftest.c:1245:1: warning: 'trace_selftest_startup_preemptoff' defined but not used [-Wunused-function]
1245 | trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_selftest.c:1062:1: warning: 'trace_selftest_startup_function_graph' defined but not used [-Wunused-function]
1062 | trace_selftest_startup_function_graph(struct tracer *trace,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_selftest.c:692:1: warning: 'trace_selftest_startup_function' defined but not used [-Wunused-function]
692 | trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:6891:6: warning: 'tracing_log_err' defined but not used [-Wunused-function]
6891 | void tracing_log_err(struct trace_array *tr,
| ^~~~~~~~~~~~~~~
kernel/trace/trace.c:6850:14: warning: 'err_pos' defined but not used [-Wunused-function]
6850 | unsigned int err_pos(char *cmd, const char *str)
| ^~~~~~~
kernel/trace/trace.c:6584:5: warning: 'tracing_event_time_stamp' defined but not used [-Wunused-function]
6584 | u64 tracing_event_time_stamp(struct trace_buffer *buffer, struct ring_buffer_event *rbe)
| ^~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:6155:5: warning: 'trace_user_fault_put' defined but not used [-Wunused-function]
6155 | int trace_user_fault_put(struct trace_user_buf_info *tinfo)
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:6136:5: warning: 'trace_user_fault_get' defined but not used [-Wunused-function]
6136 | int trace_user_fault_get(struct trace_user_buf_info *tinfo)
| ^~~~~~~~~~~~~~~~~~~~
kernel/trace/trace.c:6112:5: warning: 'trace_user_fault_init' defined but not used [-Wunused-function]
6112 | int trace_user_fault_init(struct trace_user_buf_info *tinfo, size_t size)
| ^~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/trace_selftest_startup_preemptoff +1245 kernel/trace/trace_selftest.c
60a11774b38fef Steven Rostedt 2008-05-12 1242
60a11774b38fef Steven Rostedt 2008-05-12 1243 #ifdef CONFIG_PREEMPT_TRACER
60a11774b38fef Steven Rostedt 2008-05-12 1244 int
60a11774b38fef Steven Rostedt 2008-05-12 @1245 trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr)
60a11774b38fef Steven Rostedt 2008-05-12 1246 {
6d9b3fa5e7f663 Steven Rostedt (Red Hat 2014-01-14 1247) unsigned long save_max = tr->max_latency;
60a11774b38fef Steven Rostedt 2008-05-12 1248 unsigned long count;
60a11774b38fef Steven Rostedt 2008-05-12 1249 int ret;
60a11774b38fef Steven Rostedt 2008-05-12 1250
769c48eb2530c5 Steven Rostedt 2008-11-07 1251 /*
f2cc020d7876de Ingo Molnar 2021-03-23 1252 * Now that the big kernel lock is no longer preemptible,
769c48eb2530c5 Steven Rostedt 2008-11-07 1253 * and this is called with the BKL held, it will always
769c48eb2530c5 Steven Rostedt 2008-11-07 1254 * fail. If preemption is already disabled, simply
769c48eb2530c5 Steven Rostedt 2008-11-07 1255 * pass the test. When the BKL is removed, or becomes
769c48eb2530c5 Steven Rostedt 2008-11-07 1256 * preemptible again, we will once again test this,
769c48eb2530c5 Steven Rostedt 2008-11-07 1257 * so keep it in.
769c48eb2530c5 Steven Rostedt 2008-11-07 1258 */
769c48eb2530c5 Steven Rostedt 2008-11-07 1259 if (preempt_count()) {
769c48eb2530c5 Steven Rostedt 2008-11-07 1260 printk(KERN_CONT "can not test ... force ");
769c48eb2530c5 Steven Rostedt 2008-11-07 1261 return 0;
769c48eb2530c5 Steven Rostedt 2008-11-07 1262 }
769c48eb2530c5 Steven Rostedt 2008-11-07 1263
60a11774b38fef Steven Rostedt 2008-05-12 1264 /* start the tracing */
b6f11df26fdc28 Arnaldo Carvalho de Melo 2009-02-05 1265 ret = tracer_init(trace, tr);
1c80025a49855b Frederic Weisbecker 2008-11-16 1266 if (ret) {
1c80025a49855b Frederic Weisbecker 2008-11-16 1267 warn_failed_init_tracer(trace, ret);
1c80025a49855b Frederic Weisbecker 2008-11-16 1268 return ret;
1c80025a49855b Frederic Weisbecker 2008-11-16 1269 }
1c80025a49855b Frederic Weisbecker 2008-11-16 1270
60a11774b38fef Steven Rostedt 2008-05-12 1271 /* reset the max latency */
6d9b3fa5e7f663 Steven Rostedt (Red Hat 2014-01-14 1272) tr->max_latency = 0;
60a11774b38fef Steven Rostedt 2008-05-12 1273 /* disable preemption for a bit */
60a11774b38fef Steven Rostedt 2008-05-12 1274 preempt_disable();
60a11774b38fef Steven Rostedt 2008-05-12 1275 udelay(100);
60a11774b38fef Steven Rostedt 2008-05-12 1276 preempt_enable();
490362003457f8 Frederic Weisbecker 2009-03-17 1277
490362003457f8 Frederic Weisbecker 2009-03-17 1278 /*
490362003457f8 Frederic Weisbecker 2009-03-17 1279 * Stop the tracer to avoid a warning subsequent
490362003457f8 Frederic Weisbecker 2009-03-17 1280 * to buffer flipping failure because tracing_stop()
490362003457f8 Frederic Weisbecker 2009-03-17 1281 * disables the tr and max buffers, making flipping impossible
490362003457f8 Frederic Weisbecker 2009-03-17 1282 * in case of parallels max preempt off latencies.
490362003457f8 Frederic Weisbecker 2009-03-17 1283 */
490362003457f8 Frederic Weisbecker 2009-03-17 1284 trace->stop(tr);
60a11774b38fef Steven Rostedt 2008-05-12 1285 /* stop the tracing. */
bbf5b1a0cecb56 Steven Rostedt 2008-11-07 1286 tracing_stop();
60a11774b38fef Steven Rostedt 2008-05-12 1287 /* check both trace buffers */
1c5eb4481e0151 Steven Rostedt (VMware 2020-01-09 1288) ret = trace_test_buffer(&tr->array_buffer, NULL);
60a11774b38fef Steven Rostedt 2008-05-12 1289 if (!ret)
694b3f6fe0b6c8 Steven Rostedt 2026-02-08 1290 ret = trace_test_buffer(&tr->snapshot_buffer, &count);
60a11774b38fef Steven Rostedt 2008-05-12 1291 trace->reset(tr);
bbf5b1a0cecb56 Steven Rostedt 2008-11-07 1292 tracing_start();
60a11774b38fef Steven Rostedt 2008-05-12 1293
60a11774b38fef Steven Rostedt 2008-05-12 1294 if (!ret && !count) {
60a11774b38fef Steven Rostedt 2008-05-12 1295 printk(KERN_CONT ".. no entries found ..");
60a11774b38fef Steven Rostedt 2008-05-12 1296 ret = -1;
60a11774b38fef Steven Rostedt 2008-05-12 1297 }
60a11774b38fef Steven Rostedt 2008-05-12 1298
6d9b3fa5e7f663 Steven Rostedt (Red Hat 2014-01-14 1299) tr->max_latency = save_max;
60a11774b38fef Steven Rostedt 2008-05-12 1300
60a11774b38fef Steven Rostedt 2008-05-12 1301 return ret;
60a11774b38fef Steven Rostedt 2008-05-12 1302 }
60a11774b38fef Steven Rostedt 2008-05-12 1303 #endif /* CONFIG_PREEMPT_TRACER */
60a11774b38fef Steven Rostedt 2008-05-12 1304
:::::: The code at line 1245 was first introduced by commit
:::::: 60a11774b38fef1ab90b18c5353bd1c7c4d311c8 ftrace: add self-tests
:::::: TO: Steven Rostedt <srostedt@redhat.com>
:::::: CC: Thomas Gleixner <tglx@linutronix.de>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-05-21 17:46 [mhiramat:topic/ring-buffer-bootid 4/4] kernel/trace/trace_selftest.c:1245:1: warning: 'trace_selftest_startup_preemptoff' defined but not used kernel test robot
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