tree 7f0220e2dd38b8f7c99c9b4780c97cd6513be982
parent 2ad97d473db57ab866f0756806bb94515f7f2551
author Andrii Nakryiko <andriin@fb.com> 1576288030 -0800
committer Alexei Starovoitov <ast@kernel.org> 1576456872 -0800

selftests/bpf: Add tests for libbpf-provided externs

Add a set of tests validating libbpf-provided extern variables. One crucial
feature that's tested is dead code elimination together with using invalid BPF
helper. CONFIG_MISSING is not supposed to exist and should always be specified
by libbpf as zero, which allows BPF verifier to correctly do branch pruning
and not fail validation, when invalid BPF helper is called from dead if branch.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191214014710.3449601-5-andriin@fb.com