selftests/bpf: Exit with KSFT_SKIP if no Makefile found
This would happend when we run the tests after install kselftests root@lkp-skl-d01 ~# /kselftests/run_kselftest.sh -t bpf:test_doc_build.sh TAP version 13 1..1 # selftests: bpf: test_doc_build.sh perl: warning: Setting locale failed. perl: warning: Please check that your locale settings: LANGUAGE = (unset), LC_ALL = (unset), LC_ADDRESS = "en_US.UTF-8", LC_NAME = "en_US.UTF-8", LC_MONETARY = "en_US.UTF-8", LC_PAPER = "en_US.UTF-8", LC_IDENTIFICATION = "en_US.UTF-8", LC_TELEPHONE = "en_US.UTF-8", LC_MEASUREMENT = "en_US.UTF-8", LC_TIME = "en_US.UTF-8", LC_NUMERIC = "en_US.UTF-8", LANG = "en_US.UTF-8" are supported and installed on your system. perl: warning: Falling back to the standard locale ("C"). # skip: bpftool files not found! # ok 1 selftests: bpf: test_doc_build.sh # SKIP Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210820025549.28325-1-lizhijian@cn.fujitsu.com
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