Re: [PATCH] perf/core: Fix syzkaller reported issue "Internal error in read_pmevcntrn"

[kernel test robot]

Hi Yang,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/perf/core]
[also build test ERROR on linus/master v5.19 next-20220804]
[cannot apply to 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/Yang-Jihong/perf-core-Fix-syzkaller-reported-issue-Internal-error-in-read_pmevcntrn/20220804-190347
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 326ecc15c61c349cd49d1700ff9e3e31c6fd1cd5
config: arm-randconfig-r004-20220804 (https://download.01.org/0day-ci/archive/20220805/202208050845.V2B12mSf-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 26dd42705c2af0b8f6e5d6cdb32c9bd5ed9524eb)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/intel-lab-lkp/linux/commit/9c758a8d3d13d1ac89f651850b79d91b23b41b02
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yang-Jihong/perf-core-Fix-syzkaller-reported-issue-Internal-error-in-read_pmevcntrn/20220804-190347
        git checkout 9c758a8d3d13d1ac89f651850b79d91b23b41b02
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> kernel/events/core.c:6942:20: error: use of undeclared identifier 'flags'
           local_irq_restore(flags);
                             ^
>> kernel/events/core.c:6942:20: error: use of undeclared identifier 'flags'
   2 errors generated.


vim +/flags +6942 kernel/events/core.c

  6896	
  6897	static void perf_output_read_group(struct perf_output_handle *handle,
  6898				    struct perf_event *event,
  6899				    u64 enabled, u64 running)
  6900	{
  6901		struct perf_event *leader = event->group_leader, *sub;
  6902		u64 read_format = event->attr.read_format;
  6903		u64 values[6];
  6904		int n = 0;
  6905	
  6906		values[n++] = 1 + leader->nr_siblings;
  6907	
  6908		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  6909			values[n++] = enabled;
  6910	
  6911		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  6912			values[n++] = running;
  6913	
  6914		if ((leader != event) &&
  6915		    (leader->state == PERF_EVENT_STATE_ACTIVE))
  6916			leader->pmu->read(leader);
  6917	
  6918		values[n++] = perf_event_count(leader);
  6919		if (read_format & PERF_FORMAT_ID)
  6920			values[n++] = primary_event_id(leader);
  6921		if (read_format & PERF_FORMAT_LOST)
  6922			values[n++] = atomic64_read(&leader->lost_samples);
  6923	
  6924		__output_copy(handle, values, n * sizeof(u64));
  6925	
  6926		for_each_sibling_event(sub, leader) {
  6927			n = 0;
  6928	
  6929			if ((sub != event) &&
  6930			    (sub->state == PERF_EVENT_STATE_ACTIVE))
  6931				sub->pmu->read(sub);
  6932	
  6933			values[n++] = perf_event_count(sub);
  6934			if (read_format & PERF_FORMAT_ID)
  6935				values[n++] = primary_event_id(sub);
  6936			if (read_format & PERF_FORMAT_LOST)
  6937				values[n++] = atomic64_read(&sub->lost_samples);
  6938	
  6939			__output_copy(handle, values, n * sizeof(u64));
  6940		}
  6941	
> 6942		local_irq_restore(flags);
  6943	}
  6944	

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