Re: [POC][RFC][PATCH 1/3] tracing: Add perf events

[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 errors:

[auto build test ERROR on trace/for-next]
[also build test ERROR on next-20251119]
[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/20251118003531.644484343%40kernel.org
patch subject: [POC][RFC][PATCH 1/3] tracing: Add perf events
config: arc-randconfig-6001-20251120 (https://download.01.org/0day-ci/archive/20251120/202511201604.uyinorJA-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251120/202511201604.uyinorJA-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/202511201604.uyinorJA-lkp@intel.com/

All errors (new ones prefixed by >>):

   kernel/trace/trace_output.c: In function 'trace_perf_event_print':
>> kernel/trace/trace_output.c:1681:18: error: invalid use of undefined type 'struct perf_event_entry'
    1681 |  for (val = field->values; val < end; val++) {
         |                  ^~
   kernel/trace/trace_output.c:1682:19: error: invalid use of undefined type 'struct perf_event_entry'
    1682 |   if (val != field->values)
         |                   ^~
>> kernel/trace/trace_output.c:1684:11: error: implicit declaration of function 'PERF_TRACE_VALUE' [-Werror=implicit-function-declaration]
    1684 |   value = PERF_TRACE_VALUE(*val);
         |           ^~~~~~~~~~~~~~~~
>> kernel/trace/trace_output.c:1685:11: error: implicit declaration of function 'PERF_TRACE_TYPE' [-Werror=implicit-function-declaration]
    1685 |   switch (PERF_TRACE_TYPE(*val)) {
         |           ^~~~~~~~~~~~~~~
>> kernel/trace/trace_output.c:1686:8: error: 'PERF_TRACE_CYCLES' undeclared (first use in this function)
    1686 |   case PERF_TRACE_CYCLES:
         |        ^~~~~~~~~~~~~~~~~
   kernel/trace/trace_output.c:1686:8: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/trace/trace_output.c:1689:8: error: 'PERF_TRACE_CACHE' undeclared (first use in this function); did you mean 'PERF_TYPE_HW_CACHE'?
    1689 |   case PERF_TRACE_CACHE:
         |        ^~~~~~~~~~~~~~~~
         |        PERF_TYPE_HW_CACHE
   kernel/trace/trace_output.c: In function 'trace_perf_event_raw':
   kernel/trace/trace_output.c:1714:18: error: invalid use of undefined type 'struct perf_event_entry'
    1714 |  for (val = field->values; val < end; val++) {
         |                  ^~
   kernel/trace/trace_output.c:1715:19: error: invalid use of undefined type 'struct perf_event_entry'
    1715 |   if (val != field->values)
         |                   ^~
   cc1: some warnings being treated as errors


vim +1681 kernel/trace/trace_output.c

  1665	
  1666	static enum print_line_t
  1667	trace_perf_event_print(struct trace_iterator *iter, int flags,
  1668			       struct trace_event *event)
  1669	{
  1670		struct trace_entry *entry = iter->ent;
  1671		struct trace_seq *s = &iter->seq;
  1672		struct perf_event_entry *field;
  1673		u64 value;
  1674		u64 *val;
  1675		u64 *end;
  1676	
  1677		end = (u64 *)((long)iter->ent + iter->ent_size);
  1678	
  1679		trace_assign_type(field, entry);
  1680	
> 1681		for (val = field->values; val < end; val++) {
  1682			if (val != field->values)
  1683				trace_seq_putc(s, ' ');
> 1684			value = PERF_TRACE_VALUE(*val);
> 1685			switch (PERF_TRACE_TYPE(*val)) {
> 1686			case PERF_TRACE_CYCLES:
  1687				trace_seq_printf(s, "cpu_cycles: %lld", value);
  1688				break;
> 1689			case PERF_TRACE_CACHE:
  1690				trace_seq_printf(s, "cache_misses: %lld", value);
  1691				break;
  1692			default:
  1693				trace_seq_printf(s, "unkown(%d): %lld",
  1694						 (int)PERF_TRACE_TYPE(*val), value);
  1695			}
  1696		}
  1697		trace_seq_putc(s, '\n');
  1698		return trace_handle_return(s);
  1699	}
  1700	

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