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docs/bpf: Document the semantics of BTF tags with kind_flag

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Explain the meaning of kind_flag in BTF type_tags and decl_tags.
Update uapi btf.h kind_flag comment to reflect the changes.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250130201239.1429648-3-ihor.solodrai@linux.dev
This commit is contained in:
Ihor Solodrai
2025-01-30 12:12:35 -08:00
committed by Andrii Nakryiko
parent 32bda80136
commit 2b8b896bca
1 changed files with 2 additions and 1 deletions
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include/uapi/linux/btf.h
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@@ -36,7 +36,8 @@ struct btf_type {
* bits 24-28: kind (e.g. int, ptr, array...etc) * bits 24-28: kind (e.g. int, ptr, array...etc)
* bits 29-30: unused * bits 29-30: unused
* bit 31: kind_flag, currently used by * bit 31: kind_flag, currently used by
* struct, union, enum, fwd and enum64 * struct, union, enum, fwd, enum64,
* decl_tag and type_tag
*/ */
__u32 info; __u32 info;
/* "size" is used by INT, ENUM, STRUCT, UNION, DATASEC and ENUM64. /* "size" is used by INT, ENUM, STRUCT, UNION, DATASEC and ENUM64.