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| author | Indu Bhagat <indu.bhagat@oracle.com> | 2022-07-15 01:33:10 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-07-19 19:42:09 +0300 |
| commit | e5e23424e51edbd8b3fabae382aeec0bb8926cf1 (patch) | |
| tree | 3f11751a6b0d71f55c1dba54235c8f17f02717f5 /Documentation/bpf/btf.rst | |
| parent | 3908fcddc65d04e069b03be49b33fae90e424631 (diff) | |
| download | linux-e5e23424e51edbd8b3fabae382aeec0bb8926cf1.tar.xz | |
docs/bpf: Update documentation for BTF_KIND_FUNC
The vlen bits in the BTF type of kind BTF_KIND_FUNC are used to convey the
linkage information for functions. The Linux kernel only supports
linkage values of BTF_FUNC_STATIC and BTF_FUNC_GLOBAL at this time.
Signed-off-by: Indu Bhagat <indu.bhagat@oracle.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220714223310.1140097-1-indu.bhagat@oracle.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'Documentation/bpf/btf.rst')
| -rw-r--r-- | Documentation/bpf/btf.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst index f49aeef62d0c..cf8722f96090 100644 --- a/Documentation/bpf/btf.rst +++ b/Documentation/bpf/btf.rst @@ -369,7 +369,8 @@ No additional type data follow ``btf_type``. * ``name_off``: offset to a valid C identifier * ``info.kind_flag``: 0 * ``info.kind``: BTF_KIND_FUNC - * ``info.vlen``: 0 + * ``info.vlen``: linkage information (BTF_FUNC_STATIC, BTF_FUNC_GLOBAL + or BTF_FUNC_EXTERN) * ``type``: a BTF_KIND_FUNC_PROTO type No additional type data follow ``btf_type``. @@ -380,6 +381,9 @@ type. The BTF_KIND_FUNC may in turn be referenced by a func_info in the :ref:`BTF_Ext_Section` (ELF) or in the arguments to :ref:`BPF_Prog_Load` (ABI). +Currently, only linkage values of BTF_FUNC_STATIC and BTF_FUNC_GLOBAL are +supported in the kernel. + 2.2.13 BTF_KIND_FUNC_PROTO ~~~~~~~~~~~~~~~~~~~~~~~~~~ |