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* [BPF] extend BTF_KIND_FUNC to cover global, static and extern funcsYonghong Song2020-01-101-0/+96
Previously extern function is added as BTF_KIND_VAR. This does not work well with existing BTF infrastructure as function expected to use BTF_KIND_FUNC and BTF_KIND_FUNC_PROTO. This patch added extern function to BTF_KIND_FUNC. The two bits 0:1 of btf_type.info are used to indicate what kind of function it is: 0: static 1: global 2: extern Differential Revision: https://reviews.llvm.org/D71638
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