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| author | Yonghong Song <yonghong.song@linux.dev> | 2023-07-28 04:13:42 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-07-28 04:54:17 +0300 |
| commit | 245d4c40c09bd8d5a71640950eeb074880925b9a (patch) | |
| tree | 8a3d4a4f619e77037669f3afb0f48e6733fdfc8b /Documentation/bpf/bpf_design_QA.rst | |
| parent | 0c606571ae07568b18c112d011dc8cd01d6ae346 (diff) | |
| download | linux-245d4c40c09bd8d5a71640950eeb074880925b9a.tar.xz | |
docs/bpf: Add documentation for new instructions
Add documentation in instruction-set.rst for new instruction encoding
and their corresponding operations. Also removed the question
related to 'no BPF_SDIV' in bpf_design_QA.rst since we have
BPF_SDIV insn now.
Cc: bpf@ietf.org
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230728011342.3724411-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'Documentation/bpf/bpf_design_QA.rst')
| -rw-r--r-- | Documentation/bpf/bpf_design_QA.rst | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/Documentation/bpf/bpf_design_QA.rst b/Documentation/bpf/bpf_design_QA.rst index 38372a956d65..eb19c945f4d5 100644 --- a/Documentation/bpf/bpf_design_QA.rst +++ b/Documentation/bpf/bpf_design_QA.rst @@ -140,11 +140,6 @@ A: Because if we picked one-to-one relationship to x64 it would have made it more complicated to support on arm64 and other archs. Also it needs div-by-zero runtime check. -Q: Why there is no BPF_SDIV for signed divide operation? -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -A: Because it would be rarely used. llvm errors in such case and -prints a suggestion to use unsigned divide instead. - Q: Why BPF has implicit prologue and epilogue? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A: Because architectures like sparc have register windows and in general |