clang supports arbitrary length ints using the _ExtInt extension. This can be useful to hold very large values, e.g. 256 bit or 512 bit types. Larger types (e.g. 1024 bits) are possible but I am unaware of a use case for these. This requires the _ExtInt extension enabled in clang, which is under review. Link: https://clang.llvm.org/docs/LanguageExtensions.html#extended-integer-types Link: https://reviews.llvm.org/D93103 Signed-off-by: Sean Young <sean@xxxxxxxx> changes since v2: - split patches into 4 distinct patches changes since v1: - added tests as suggested by Yonghong Song - added kernel pretty-printer Sean Young (4): btf: add support for ints larger than 128 bits libbpf: add support for ints larger than 128 bits bpftool: add support for ints larger than 128 bits bpf: add tests for ints larger than 128 bits Documentation/bpf/btf.rst | 4 +- include/uapi/linux/btf.h | 2 +- kernel/bpf/btf.c | 54 +- tools/bpf/bpftool/btf_dumper.c | 40 ++ tools/include/uapi/linux/btf.h | 2 +- tools/lib/bpf/btf.c | 2 +- tools/testing/selftests/bpf/Makefile | 3 +- tools/testing/selftests/bpf/prog_tests/btf.c | 3 +- .../selftests/bpf/progs/test_btf_extint.c | 50 ++ tools/testing/selftests/bpf/test_extint.py | 535 ++++++++++++++++++ 10 files changed, 679 insertions(+), 16 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/test_btf_extint.c create mode 100755 tools/testing/selftests/bpf/test_extint.py -- 2.29.2
