bpf_mem_alloc_init
int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu);
ret = bpf_mem_alloc_init(&bpf_global_ma, 0, false);
ret = bpf_mem_alloc_init(&bpf_cpumask_ma, sizeof(struct bpf_cpumask), false);
err = bpf_mem_alloc_init(&htab->ma, htab->elem_size, false);
err = bpf_mem_alloc_init(&htab->pcpu_ma,
err = bpf_mem_alloc_init(&trie->ma, leaf_size, false);