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libbpf: Do not resolve size on duplicate FUNCs

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FUNCs do not have sizes, thus currently btf__resolve_size will fail
with -EINVAL. Add conditions so that we only update size when the BTF
object is not function or function prototype.

Signed-off-by: Eric Long <i@hack3r.moe>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241002-libbpf-dup-extern-funcs-v4-1-560eb460ff90@hack3r.moe
This commit is contained in:
Eric Long 2024-10-02 14:25:06 +08:00 committed by Andrii Nakryiko
parent c50fc1cbfd
commit 4b146e95da
1 changed files with 4 additions and 0 deletions
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4
tools/lib/bpf/linker.c
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@ -2451,6 +2451,10 @@ static int linker_append_btf(struct bpf_linker *linker, struct src_obj *obj)
if (glob_sym && glob_sym->var_idx >= 0) {
__s64 sz;
/* FUNCs don't have size, nothing to update */
if (btf_is_func(t))
continue;
dst_var = &dst_sec->sec_vars[glob_sym->var_idx];
/* Because underlying BTF type might have
* changed, so might its size have changed, so