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bpf: Remove unused BTF_FMODEL_STRUCT_ARG

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Commit 814cba835e ("bpf, x86: Fix trampoline stack size for 128-bit
arguments") changed the x86 trampoline to compute the number of
registers from arg_size for every argument, which removed the last user
of BTF_FMODEL_STRUCT_ARG. No other architecture or verifier code looks
at the flag, so remove the macro and the code in __get_type_fmodel_flags()
which sets it.

Keep BTF_FMODEL_SIGNED_ARG at BIT(1) rather than renumbering it to
BIT(0), so BIT(0) is available for a future flag.

No functional change.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20260803052726.2821447-1-yonghong.song@linux.dev
This commit is contained in:
Yonghong Song
2026-08-02 22:27:26 -07:00
committed by Daniel Borkmann
parent 60781269e2
commit 457d4ecb47
2 changed files with 0 additions and 5 deletions
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3
include/linux/bpf.h
View File

@@ -1207,9 +1207,6 @@ struct bpf_prog_offload {
u32 jited_len;
};
/* The argument is a structure or a union. */
#define BTF_FMODEL_STRUCT_ARG BIT(0)
/* The argument is signed. */
#define BTF_FMODEL_SIGNED_ARG BIT(1)

2
kernel/bpf/btf.c
View File

@@ -7533,8 +7533,6 @@ static u8 __get_type_fmodel_flags(const struct btf_type *t)
{
u8 flags = 0;
if (btf_type_is_struct(t))
flags |= BTF_FMODEL_STRUCT_ARG;
if (btf_type_is_signed_int(t))
flags |= BTF_FMODEL_SIGNED_ARG;