netdev - Re: [PATCH bpf-next v4 2/5] libbpf: Store map pin path and status in struct bpf

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Message-ID: <8736f8om96.fsf@toke.dk>
Date:   Thu, 31 Oct 2019 18:31:01 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next v4 2/5] libbpf: Store map pin path and status in struct bpf_map

Andrii Nakryiko <andrii.nakryiko@...il.com> writes:

> [...]
>
>>
>>         return err;
>> @@ -4131,17 +4205,24 @@ int bpf_object__unpin_maps(struct bpf_object *obj, const char *path)
>>                 return -ENOENT;
>>
>>         bpf_object__for_each_map(map, obj) {
>> +               char *pin_path = NULL;
>>                 char buf[PATH_MAX];
>
> you can call buf as pin_path and get rid of extra pointer?

The idea here is to end up with bpf_map__unpin(map, NULL) if path is
unset. GCC complains if I reassign a static array pointer, so don't
think I can actually get rid of this?

-Toke