Change libbpf's bpf_endian.h header to be compatible when used with system headers and when using just vmlinux.h. This is a frequent request for users writing BPF CO-RE applications. Do this by re-implementing byte swap compile-time macros. Also add simple tests validating correct results both for byte-swapping built-ins and macros. v2->v3: - explicit zero-initialization of global variables (Daniel); v1->v2: - reimplement byte swapping macros (Alexei). Andrii Nakryiko (2): libbpf: make bpf_endian co-exist with vmlinux.h selftests/bpf: add byte swapping selftest tools/lib/bpf/bpf_endian.h | 43 ++++++++++++--- .../testing/selftests/bpf/prog_tests/endian.c | 53 +++++++++++++++++++ .../testing/selftests/bpf/progs/test_endian.c | 37 +++++++++++++ 3 files changed, 125 insertions(+), 8 deletions(-) create mode 100644 tools/testing/selftests/bpf/prog_tests/endian.c create mode 100644 tools/testing/selftests/bpf/progs/test_endian.c -- 2.24.1
