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| author | Dave Thaler <dthaler@microsoft.com> | 2022-09-27 18:59:47 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-30 13:41:25 -0700 |
| commit | ee159bdbdbce293e66d7b9249208f367faff5d81 (patch) | |
| tree | 20fd3190d032d059639ed23a001f18a7ef4d69bb /Documentation/bpf | |
| parent | 6c7aaffb24efbd5d1ae067b2b629b3ffcc37e18e (diff) | |
| download | linux-ee159bdbdbce293e66d7b9249208f367faff5d81.tar.gz | |
bpf, docs: Add Clang note about BPF_ALU
Add Clang note about BPF_ALU.
Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Link: https://lore.kernel.org/r/20220927185958.14995-4-dthaler1968@googlemail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/clang-notes.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/bpf/clang-notes.rst b/Documentation/bpf/clang-notes.rst index b15179cb51177..528feddf2db90 100644 --- a/Documentation/bpf/clang-notes.rst +++ b/Documentation/bpf/clang-notes.rst @@ -14,6 +14,12 @@ Clang defined "CPU" versions, where a CPU version of 3 corresponds to the curren Clang can select the eBPF ISA version using ``-mcpu=v3`` for example to select version 3. +Arithmetic instructions +======================= + +For CPU versions prior to 3, Clang v7.0 and later can enable ``BPF_ALU`` support with +``-Xclang -target-feature -Xclang +alu32``. In CPU version 3, support is automatically included. + Atomic operations ================= |