kernel/tools/testing/selftests/bpf/progs/linked_funcs2.c, branch linux-6.2.y

selftests/bpf: Add CO-RE relos and SEC("?...") to linked_funcs selftests

2022-04-26T22:41:46Z

Enhance linked_funcs selftest with two tricky features that might not obviously work correctly together. We add CO-RE relocations to entry BPF programs and mark those programs as non-autoloadable with SEC("?...") annotation. This makes sure that libbpf itself handles .BTF.ext CO-RE relocation data matching correctly for SEC("?...") programs, as well as ensures that BPF static linker handles this correctly (this was the case before, no changes are necessary, but it wasn't explicitly tested). Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220426004511.2691730-6-andrii@kernel.org

selftests/bpf: Add CO-RE relos into linked_funcs selftests

2022-04-08T20:24:15Z

Add CO-RE relocations into __weak subprogs for multi-file linked_funcs selftest to make sure libbpf handles such combination well. Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20220408181425.2287230-4-andrii@kernel.org

selftests/bpf: Add function linking selftest

2021-04-23T21:05:27Z

Add selftest validating various aspects of statically linking functions: - no conflicts and correct resolution for name-conflicting static funcs; - correct resolution of extern functions; - correct handling of weak functions, both resolution itself and libbpf's handling of unused weak function that "lost" (it leaves gaps in code with no ELF symbols); - correct handling of hidden visibility to turn global function into "static" for the purpose of BPF verification. Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20210423181348.1801389-16-andrii@kernel.org