tools/perf/util/bpf_skel/vmlinux/vmlinux.h: warning: ignored by one of the .gitignore files

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
commit: b7a2d774c9c5a9a3228c6169ecf32f05b96609cf perf build: Add ability to build with a generated vmlinux.h
date:   2 weeks ago
config: powerpc-allnoconfig (https://download.01.org/0day-ci/archive/20230710/202307101239.qYEDPWtZ-lkp@xxxxxxxxx/config)
compiler: powerpc-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230710/202307101239.qYEDPWtZ-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307101239.qYEDPWtZ-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> tools/perf/util/bpf_skel/vmlinux/vmlinux.h: warning: ignored by one of the .gitignore files
   tools/testing/selftests/arm64/tags/.gitignore: warning: ignored by one of the .gitignore files
   tools/testing/selftests/arm64/tags/Makefile: warning: ignored by one of the .gitignore files
   tools/testing/selftests/arm64/tags/run_tags_test.sh: warning: ignored by one of the .gitignore files
   tools/testing/selftests/arm64/tags/tags_test.c: warning: ignored by one of the .gitignore files
   tools/testing/selftests/kvm/.gitignore: warning: ignored by one of the .gitignore files
   tools/testing/selftests/kvm/Makefile: warning: ignored by one of the .gitignore files
   tools/testing/selftests/kvm/config: warning: ignored by one of the .gitignore files
   tools/testing/selftests/kvm/settings: warning: ignored by one of the .gitignore files

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