selftests/bpf: add auto-detach test
Add a kselftest to cover bpf auto-detachment functionality. The test creates a cgroup, associates some resources with it, attaches a couple of bpf programs and deletes the cgroup. Then it checks that bpf programs are going away in 5 seconds. Expected output: $ ./test_cgroup_attach #override:PASS #multi:PASS #autodetach:PASS test_cgroup_attach:PASS On a kernel without auto-detaching: $ ./test_cgroup_attach #override:PASS #multi:PASS #autodetach:FAIL test_cgroup_attach:FAIL Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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