btf_get_by_fd      18 include/linux/btf.h struct btf *btf_get_by_fd(int fd);
btf_get_by_fd     591 kernel/bpf/syscall.c 		btf = btf_get_by_fd(attr->btf_fd);
btf_get_by_fd    6736 kernel/bpf/verifier.c 	btf = btf_get_by_fd(attr->prog_btf_fd);