Re: [PATCH bpf-next v1 03/19] bpf: add bpf_map iterator

Alexei Starovoitov
2020-04-29T00:48:46Z

On 4/28/20 5:37 PM, Martin KaFai Lau wrote:
>> + prog = bpf_iter_get_prog(seq, sizeof(struct bpf_iter_seq_map_info),
>> + &meta.session_id, &meta.seq_num,
>> + v == (void *)0);
> From looking at seq_file.c, when will show() be called with "v == NULL"?
>

that v == NULL here and the whole verifier change just to allow NULL...
may be use seq_num as an indicator of the last elem instead?
Like seq_num with upper bit set to indicate that it's last?