docs/bpf: Update documentation for BTF_KIND_DECL_TAG typedef support
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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@ -474,7 +474,7 @@ No additional type data follow ``btf_type``.
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* ``info.kind_flag``: 0
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* ``info.kind``: BTF_KIND_DECL_TAG
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* ``info.vlen``: 0
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* ``type``: ``struct``, ``union``, ``func`` or ``var``
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* ``type``: ``struct``, ``union``, ``func``, ``var`` or ``typedef``
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``btf_type`` is followed by ``struct btf_decl_tag``.::
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@ -483,8 +483,8 @@ No additional type data follow ``btf_type``.
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};
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The ``name_off`` encodes btf_decl_tag attribute string.
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The ``type`` should be ``struct``, ``union``, ``func`` or ``var``.
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For ``var`` type, ``btf_decl_tag.component_idx`` must be ``-1``.
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The ``type`` should be ``struct``, ``union``, ``func``, ``var`` or ``typedef``.
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For ``var`` or ``typedef`` type, ``btf_decl_tag.component_idx`` must be ``-1``.
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For the other three types, if the btf_decl_tag attribute is
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applied to the ``struct``, ``union`` or ``func`` itself,
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``btf_decl_tag.component_idx`` must be ``-1``. Otherwise,
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