BPF_MAP_FREEZE 1173 kernel/bpf/syscall.c if (CHECK_ATTR(BPF_MAP_FREEZE)) BPF_MAP_FREEZE 2879 kernel/bpf/syscall.c case BPF_MAP_FREEZE: BPF_MAP_FREEZE 438 tools/lib/bpf/bpf.c return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));