Commit bd16dee6 authored by Yonghong Song's avatar Yonghong Song Committed by Alexei Starovoitov
Browse files

bpf: Add BTF_KIND_DECL_TAG typedef support 

The llvm patches ([1], [2]) added support to attach btf_decl_tag
attributes to typedef declarations. This patch added
support in kernel.

  [1] https://reviews.llvm.org/D110127
  [2] https://reviews.llvm.org/D112259



Signed-off-by: default avatarYonghong Song <yhs@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211021195628.4018847-1-yhs@fb.com
parent a33f607f

kernel/bpf/btf.c

+2 −2
Original line number Diff line number Diff line
@@ -468,7 +468,7 @@ static bool btf_type_is_decl_tag(const struct btf_type *t) 
static bool btf_type_is_decl_tag_target(const struct btf_type *t)

{

	return btf_type_is_func(t) || btf_type_is_struct(t) ||

	       btf_type_is_var(t);

	       btf_type_is_var(t) || btf_type_is_typedef(t);

}



u32 btf_nr_types(const struct btf *btf)
@@ -3885,7 +3885,7 @@ static int btf_decl_tag_resolve(struct btf_verifier_env *env, 


	component_idx = btf_type_decl_tag(t)->component_idx;

	if (component_idx != -1) {

		if (btf_type_is_var(next_type)) {

		if (btf_type_is_var(next_type) || btf_type_is_typedef(next_type)) {

			btf_verifier_log_type(env, v->t, "Invalid component_idx");

			return -EINVAL;

		}