netdev - Re: [PATCH bpf-next 1/2] bpf: set inner_map_meta->spin_lock

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Date:   Thu, 28 Feb 2019 00:56:31 +0000
From:   Alexei Starovoitov <ast@...com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Yonghong Song <yhs@...com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next 1/2] bpf: set inner_map_meta->spin_lock_off
 correctly

On 2/27/19 4:28 PM, Andrii Nakryiko wrote:
> No, it won't, because bpf_map_meta_alloc explicitly tests for it:
> 
>          if (map_value_has_spin_lock(inner_map)) {
>                  fdput(f);
>                  return ERR_PTR(-ENOTSUPP);
>          }
> 
> Maybe Alexei can clarify?

inner map can be replaced while progs are running.
I don't think added complexity is worth it.
Hence it's disallowed for time being.