btf_dedup_identity_hash_fn
static size_t btf_dedup_identity_hash_fn(long key, void *ctx);
p.str_off_map = hashmap__new(btf_dedup_identity_hash_fn, btf_dedup_equal_fn, NULL);
hashmap_hash_fn hash_fn = btf_dedup_identity_hash_fn;
names_map = hashmap__new(btf_dedup_identity_hash_fn, btf_dedup_equal_fn, NULL);
dist.pipe.str_off_map = hashmap__new(btf_dedup_identity_hash_fn, btf_dedup_equal_fn, NULL);