Yonghong Song fad7357469 bpf: Support for new btf kind BTF_KIND_TAG ... LLVM14 added support for a new C attribute ([1]) __attribute__((btf_tag("arbitrary_str"))) This attribute will be emitted to dwarf ([2]) and pahole will convert it to BTF. Or for bpf target, this attribute will be emitted to BTF directly ([3], [4]). The attribute is intended to provide additional information for - struct/union type or struct/union member - static/global variables - static/global function or function parameter. For linux kernel, the btf_tag can be applied in various places to specify user pointer, function pre- or post- condition, function allow/deny in certain context, etc. Such information will be encoded in vmlinux BTF and can be used by verifier. The btf_tag can also be applied to bpf programs to help global verifiable functions, e.g., specifying preconditions, etc. This patch added basic parsing and checking support in kernel for new BTF_KIND_TAG kind. [1] https://reviews.llvm.org/D106614 [2] https://reviews.llvm.org/D106621 [3] https://reviews.llvm.org/D106622 [4] https://reviews.llvm.org/D109560 Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210914223015.245546-1-yhs@fb.com		2021-09-17 14:03:39 -07:00
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asm	AF_XDP: add xsk.{c,h} to Makefile and fix build	2019-03-05 09:22:54 -08:00
linux	include: implement list_empty() and list_for_each_entry()	2020-09-03 21:21:34 -07:00
uapi/linux	bpf: Support for new btf kind BTF_KIND_TAG	2021-09-17 14:03:39 -07:00