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defined in the base > are not removed. This is because the hash used for base types differs > from the one used in the deduplication logic in btf_dedup_struct_type. > > This was introduced by the referenced commit when moving the typedef > deduplication logic handling from btf_dedup_ref_type to > btf_dedup_struct_type, as this also changed the hash logic > (btf_hash_common to btf_hash_typedef). > > This also impacts other types referencing those typedef (e.g. const). In > my test, the BTF section size of the openvswitch module went from 31KB > to 45KB. > > Cc: Paul Houssel > Fixes: 3781413465df ("libbpf: Fix BTF dedup to support recursive typedef definitions"). > Signed-off-by: Antoine Tenart Nice catch! It would be great to have test coverage for this in prog_tests/btf_dedup_split.c ; adding a duplicated typedef to base and split BTF in test_split_simple() and ensuring it's removed from split BTF would do the trick I think. > --- > tools/lib/bpf/btf.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c > index ceb57b46a878..771aeaa0262b 100644 > --- a/tools/lib/bpf/btf.c > +++ b/tools/lib/bpf/btf.c > @@ -4578,12 +4578,14 @@ static int btf_dedup_prep(struct btf_dedup *d) > case BTF_KIND_RESTRICT: > case BTF_KIND_PTR: > case BTF_KIND_FWD: > - case BTF_KIND_TYPEDEF: > case BTF_KIND_FUNC: > case BTF_KIND_FLOAT: > case BTF_KIND_TYPE_TAG: > h = btf_hash_common(t); > break; > + case BTF_KIND_TYPEDEF: > + h = btf_hash_typedef(t); > + break; > case BTF_KIND_INT: > case BTF_KIND_DECL_TAG: > h = btf_hash_int_decl_tag(t);