Re: [PATCH 1/4] powerpc/perf: Add perf interface to expose vpa counters

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

Hi Kajol,

kernel test robot noticed the following build warnings:

[auto build test WARNING on powerpc/topic/ppc-kvm]
[also build test WARNING on powerpc/next powerpc/fixes linus/master v6.12-rc7 next-20241115]
[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/Kajol-Jain/docs-ABI-sysfs-bus-event_source-devices-vpa-pmu-Document-sysfs-event-format-entries-for-vpa_pmu/20241114-164451
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git topic/ppc-kvm
patch link:    https://lore.kernel.org/r/20241114084013.1140010-1-kjain%40linux.ibm.com
patch subject: [PATCH 1/4] powerpc/perf: Add perf interface to expose vpa counters
config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20241117/202411171117.Eq9JtACb-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241117/202411171117.Eq9JtACb-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/202411171117.Eq9JtACb-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/perf/vpa-pmu.c:10:
   In file included from include/linux/perf_event.h:50:
   In file included from include/linux/pid_namespace.h:7:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> arch/powerpc/perf/vpa-pmu.c:87:32: warning: overlapping comparisons always evaluate to false [-Wtautological-overlap-compare]
      87 |         if ((event->attr.config <= 0) && (event->attr.config > 3))
         |             ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
   5 warnings generated.


vim +87 arch/powerpc/perf/vpa-pmu.c

    72	
    73	static int vpa_pmu_event_init(struct perf_event *event)
    74	{
    75		if (event->attr.type != event->pmu->type)
    76			return -ENOENT;
    77	
    78		/* it does not support event sampling mode */
    79		if (is_sampling_event(event))
    80			return -EOPNOTSUPP;
    81	
    82		/* no branch sampling */
    83		if (has_branch_stack(event))
    84			return -EOPNOTSUPP;
    85	
    86		/* Invalid event code */
  > 87		if ((event->attr.config <= 0) && (event->attr.config > 3))
    88			return -EINVAL;
    89	
    90		return 0;
    91	}
    92	

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