linux-kernel - Re: [PATCH v3 13/13] tracing: Have persistent ring buffer print syscalls normally

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Message-ID: <202510161708.yF2I7Qqq-lkp@intel.com>
Date: Thu, 16 Oct 2025 18:33:19 +0800
From: kernel test robot <lkp@...el.com>
To: Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Takaya Saeki <takayas@...gle.com>, Tom Zanussi <zanussi@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ian Rogers <irogers@...gle.com>,
	Douglas Raillard <douglas.raillard@....com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 13/13] tracing: Have persistent ring buffer print
 syscalls normally

Hi Steven,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.18-rc1 next-20251015]
[cannot apply to trace/for-next acme/perf/core]
[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-Make-trace_user_fault_read-exposed-to-rest-of-tracing/20251016-014059
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20251015173550.225723717%40kernel.org
patch subject: [PATCH v3 13/13] tracing: Have persistent ring buffer print syscalls normally
config: s390-randconfig-001-20251016 (https://download.01.org/0day-ci/archive/20251016/202510161708.yF2I7Qqq-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251016/202510161708.yF2I7Qqq-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510161708.yF2I7Qqq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/trace/trace.c:4258:26: error: use of undeclared identifier 'enter_syscall_print_funcs'
    4258 |                             (event->funcs != &enter_syscall_print_funcs) &&
         |                                               ^
>> kernel/trace/trace.c:4259:26: error: use of undeclared identifier 'exit_syscall_print_funcs'
    4259 |                             (event->funcs != &exit_syscall_print_funcs))
         |                                               ^
   kernel/trace/trace.c:11443:32: error: use of undeclared identifier 'CONFIG_TRACE_SYSCALL_BUF_SIZE_DEFAULT'
    11443 |         global_trace.syscall_buf_sz = CONFIG_TRACE_SYSCALL_BUF_SIZE_DEFAULT;
          |                                       ^
   3 errors generated.


vim +/enter_syscall_print_funcs +4258 kernel/trace/trace.c

  4222	
  4223	static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
  4224	{
  4225		struct trace_array *tr = iter->tr;
  4226		struct trace_seq *s = &iter->seq;
  4227		unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK);
  4228		struct trace_entry *entry;
  4229		struct trace_event *event;
  4230	
  4231		entry = iter->ent;
  4232	
  4233		test_cpu_buff_start(iter);
  4234	
  4235		event = ftrace_find_event(entry->type);
  4236	
  4237		if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) {
  4238			if (iter->iter_flags & TRACE_FILE_LAT_FMT)
  4239				trace_print_lat_context(iter);
  4240			else
  4241				trace_print_context(iter);
  4242		}
  4243	
  4244		if (trace_seq_has_overflowed(s))
  4245			return TRACE_TYPE_PARTIAL_LINE;
  4246	
  4247		if (event) {
  4248			if (tr->trace_flags & TRACE_ITER_FIELDS)
  4249				return print_event_fields(iter, event);
  4250			/*
  4251			 * For TRACE_EVENT() events, the print_fmt is not
  4252			 * safe to use if the array has delta offsets
  4253			 * Force printing via the fields.
  4254			 */
  4255			if ((tr->text_delta)) {
  4256				/* ftrace and system call events are still OK */
  4257				if ((event->type > __TRACE_LAST_TYPE) &&
> 4258				    (event->funcs != &enter_syscall_print_funcs) &&
> 4259				    (event->funcs != &exit_syscall_print_funcs))
  4260				return print_event_fields(iter, event);
  4261			}
  4262			return event->funcs->trace(iter, sym_flags, event);
  4263		}
  4264	
  4265		trace_seq_printf(s, "Unknown type %d\n", entry->type);
  4266	
  4267		return trace_handle_return(s);
  4268	}
  4269	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki