From: Sean Young <sean@mess.org>
To: "Yonghong Song" <yhs@fb.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Nathan Chancellor" <natechancellor@gmail.com>,
"Nick Desaulniers" <ndesaulniers@google.com>,
"Quentin Monnet" <quentin@isovalent.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
linux-doc@vger.kernel.org, netdev@vger.kernel.org,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com
Subject: [PATCH v3 0/4] btf: support ints larger than 128 bits
Date: Tue, 5 Jan 2021 14:45:30 +0000 [thread overview]
Message-ID: <cover.1609855479.git.sean@mess.org> (raw)
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@mess.org>
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
next reply other threads:[~2021-01-05 14:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-05 14:45 Sean Young [this message]
2021-01-05 14:45 ` [PATCH v3 1/4] btf: add support for ints larger than 128 bits Sean Young
2021-01-06 5:10 ` Andrii Nakryiko
2021-01-06 5:16 ` Andrii Nakryiko
2021-01-05 14:45 ` [PATCH v3 2/4] libbpf: " Sean Young
2021-01-05 14:45 ` [PATCH v3 3/4] bpftool: " Sean Young
2021-01-06 5:13 ` Andrii Nakryiko
2021-01-05 14:45 ` [PATCH v3 4/4] bpf: add tests " Sean Young
2021-01-06 5:26 ` Andrii Nakryiko
2021-01-05 19:51 ` [PATCH v3 0/4] btf: support " Martin KaFai Lau
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