Re: [POC][RFC][PATCH 2/3] ftrace: Add perf counters to function tracing

[kernel test robot <lkp@intel.com>]

Hi Steven,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on trace/for-next]
[also build test WARNING on next-20251120]
[cannot apply to linus/master v6.18-rc6]
[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-Add-perf-events/20251118-083721
base:   https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next
patch link:    https://lore.kernel.org/r/20251118003531.805883570%40kernel.org
patch subject: [POC][RFC][PATCH 2/3] ftrace: Add perf counters to function tracing
config: s390-randconfig-001-20251120 (https://download.01.org/0day-ci/archive/20251120/202511201931.aqNiFonA-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251120/202511201931.aqNiFonA-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/202511201931.aqNiFonA-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/trace/trace_functions.c:538:5: warning: 'CONFIG_PERF_EVENTS' is not defined, evaluates to 0 [-Wundef]
     538 | #if CONFIG_PERF_EVENTS
         |     ^
   1 warning generated.


vim +/CONFIG_PERF_EVENTS +538 kernel/trace/trace_functions.c

   529	
   530	static struct tracer_opt func_opts[] = {
   531	#ifdef CONFIG_STACKTRACE
   532		{ TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
   533	#endif
   534		{ TRACER_OPT(func-no-repeats, TRACE_FUNC_OPT_NO_REPEATS) },
   535	#ifdef CONFIG_FUNCTION_TRACE_ARGS
   536		{ TRACER_OPT(func-args, TRACE_FUNC_OPT_ARGS) },
   537	#endif
 > 538	#if CONFIG_PERF_EVENTS
   539		{ TRACER_OPT(func-cpu-cycles, TRACE_FUNC_OPT_PERF_CYCLES) },
   540		{ TRACER_OPT(func-cache-misses, TRACE_FUNC_OPT_PERF_CACHE) },
   541	#endif
   542		{ } /* Always set a last empty entry */
   543	};
   544	

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