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由 Yonghong Song 提交于
mainline inclusion from mainline-5.16-rc1 commit 223f903e category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=223f903e9c832699f4e5f422281a60756c1c6cfe ------------------------------------------------- Patch set [1] introduced BTF_KIND_TAG to allow tagging declarations for struct/union, struct/union field, var, func and func arguments and these tags will be encoded into dwarf. They are also encoded to btf by llvm for the bpf target. After BTF_KIND_TAG is introduced, we intended to use it for kernel __user attributes. But kernel __user is actually a type attribute. Upstream and internal discussion showed it is not a good idea to mix declaration attribute and type attribute. So we proposed to introduce btf_type_tag as a type attribute and existing btf_tag renamed to btf_decl_tag ([2]). This patch renamed BTF_KIND_TAG to BTF_KIND_DECL_TAG and some other declarations with *_tag to *_decl_tag to make it clear the tag is for declaration. In the future, BTF_KIND_TYPE_TAG might be introduced per [3]. [1] https://lore.kernel.org/bpf/20210914223004.244411-1-yhs@fb.com/ [2] https://reviews.llvm.org/D111588 [3] https://reviews.llvm.org/D111199 Fixes: b5ea834d ("bpf: Support for new btf kind BTF_KIND_TAG") Fixes: 5b84bd10 ("libbpf: Add support for BTF_KIND_TAG") Fixes: 5c07f2fe ("bpftool: Add support for BTF_KIND_TAG") Signed-off-by: NYonghong Song <yhs@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211012164838.3345699-1-yhs@fb.com (cherry picked from commit 223f903e) Signed-off-by: NWang Yufen <wangyufen@huawei.com> Conflicts: Documentation/bpf/btf.rst kernel/bpf/btf.c tools/bpf/bpftool/btf.c tools/lib/bpf/libbpf.c tools/testing/selftests/bpf/README.rst tools/testing/selftests/bpf/btf_helpers.c tools/testing/selftests/bpf/prog_tests/btf.c tools/testing/selftests/bpf/prog_tests/btf_write.c tools/testing/selftests/bpf/progs/tag.c tools/testing/selftests/bpf/test_btf.h Signed-off-by: NWang Yufen <wangyufen@huawei.com>
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