On Tue, Oct 12, 2021 at 9:48 AM Yonghong Song <yhs@xxxxxx> wrote: > > 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@xxxxxx/ > [2] https://reviews.llvm.org/D111588 > [3] https://reviews.llvm.org/D111199 > > Fixes: b5ea834dde6b ("bpf: Support for new btf kind BTF_KIND_TAG") > Fixes: 5b84bd10363e ("libbpf: Add support for BTF_KIND_TAG") > Fixes: 5c07f2fec003 ("bpftool: Add support for BTF_KIND_TAG") > Signed-off-by: Yonghong Song <yhs@xxxxxx> > --- Patch bot missed this, but this was applied a while ago ([0]). [0] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=223f903e9c832699f4e5f422281a60756c1c6cfe [...]
