From: Yonghong Song <yhs@fb.com>
Date: Thu, 21 Oct 2021 12:56:28 -0700
Subject: bpf: Add BTF_KIND_DECL_TAG typedef support
Patch-mainline: v5.16-rc1
Git-commit: bd16dee66ae4de3f1726c69ac901d2b7a53b0c86
References: jsc#PED-1377
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
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
kernel/bpf/btf.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -468,7 +468,7 @@ static bool btf_type_is_decl_tag(const s
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 b
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;
}