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docs/bpf: Update documentation for BTF_KIND_DECL_TAG typedef support

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Add BTF_KIND_DECL_TAG typedef support in btf.rst.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211021195649.4020514-1-yhs@fb.com
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Yonghong Song 2021-10-21 12:56:49 -07:00 committed by Alexei Starovoitov
parent 8c18ea2d2c
commit 5a8671349d
1 changed files with 3 additions and 3 deletions
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Documentation/bpf/btf.rst
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@ -474,7 +474,7 @@ No additional type data follow ``btf_type``.
* ``info.kind_flag``: 0 * ``info.kind_flag``: 0
* ``info.kind``: BTF_KIND_DECL_TAG * ``info.kind``: BTF_KIND_DECL_TAG
* ``info.vlen``: 0 * ``info.vlen``: 0
* ``type``: ``struct``, ``union``, ``func`` or ``var`` * ``type``: ``struct``, ``union``, ``func``, ``var`` or ``typedef``
``btf_type`` is followed by ``struct btf_decl_tag``.:: ``btf_type`` is followed by ``struct btf_decl_tag``.::
@ -483,8 +483,8 @@ No additional type data follow ``btf_type``.
}; };
The ``name_off`` encodes btf_decl_tag attribute string. The ``name_off`` encodes btf_decl_tag attribute string.
The ``type`` should be ``struct``, ``union``, ``func`` or ``var``. The ``type`` should be ``struct``, ``union``, ``func``, ``var`` or ``typedef``.
For ``var`` type, ``btf_decl_tag.component_idx`` must be ``-1``. For ``var`` or ``typedef`` type, ``btf_decl_tag.component_idx`` must be ``-1``.
For the other three types, if the btf_decl_tag attribute is For the other three types, if the btf_decl_tag attribute is
applied to the ``struct``, ``union`` or ``func`` itself, applied to the ``struct``, ``union`` or ``func`` itself,
``btf_decl_tag.component_idx`` must be ``-1``. Otherwise, ``btf_decl_tag.component_idx`` must be ``-1``. Otherwise,