selftests/bpf: Add bpffs preload test.

Add a test that mounts two bpffs instances and checks progs.debug
and maps.debug for sanity data.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200819042759.51280-5-alexei.starovoitov@gmail.com
1 file changed