bpf: Let the by-value struct walk take the kinds of member it accepts

btf_struct_member_walk() hardcodes that every member of a struct returned
by value must be a scalar. A later patch needs the same walk to also
accept arena pointers, so give it a mask of the member kinds it allows.

The mask reaches callers through btf_struct_is_composed_of(), which
replaces btf_type_is_scalar_struct() as the entry point exported to
btf.c. btf_type_is_scalar_struct() stays as a verifier-local wrapper for
the call sites that only ever ask about scalars.

There is no functional change: btf_member_kind_allowed() is exactly
btf_type_is_scalar() when the mask is BTF_MEMBER_SCALAR alone, and the
shared check is the last statement of the loop body, so dropping the array
branch's continue neither skips a member nor checks one twice.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260829061534.1693789-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

0 files changed, 0 insertions, 0 deletions