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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: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211021195628.4018847-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2021-10-21 12:56:28 -07:00 committed by Alexei Starovoitov
parent a33f607f68
commit bd16dee66a
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/btf.c
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@ -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) static bool btf_type_is_decl_tag_target(const struct btf_type *t)
{ {
return btf_type_is_func(t) || btf_type_is_struct(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) 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; component_idx = btf_type_decl_tag(t)->component_idx;
if (component_idx != -1) { 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"); btf_verifier_log_type(env, v->t, "Invalid component_idx");
return -EINVAL; return -EINVAL;
} }