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

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Date:   Tue, 28 Apr 2020 17:48:27 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>
CC:     Andrii Nakryiko <andriin@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, Daniel Borkmann <daniel@...earbox.net>,
        <kernel-team@...com>
Subject: Re: [PATCH bpf-next v1 03/19] bpf: add bpf_map iterator

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?