netdev - Re: [PATCH bpf-next] bpf: guard bpf_get_current_cgroup_id() with CONFIG

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Date:   Mon, 4 Jun 2018 21:53:49 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Yonghong Song <yhs@...com>, ast@...com, netdev@...r.kernel.org
Cc:     kernel-team@...com
Subject: Re: [PATCH bpf-next] bpf: guard bpf_get_current_cgroup_id() with
 CONFIG_CGROUPS

On 06/04/2018 05:53 PM, Yonghong Song wrote:
> Commit bf6fa2c893c5 ("bpf: implement bpf_get_current_cgroup_id()
> helper") introduced a new helper bpf_get_current_cgroup_id().
> The helper has a dependency on CONFIG_CGROUPS.
> 
> When CONFIG_CGROUPS is not defined, using the helper will result
> the following verifier error:
>   kernel subsystem misconfigured func bpf_get_current_cgroup_id#80
> which is hard for users to interpret.
> Guarding the reference to bpf_get_current_cgroup_id_proto with
> CONFIG_CGROUPS will result in below better message:
>   unknown func bpf_get_current_cgroup_id#80
> 
> Fixes: bf6fa2c893c5 ("bpf: implement bpf_get_current_cgroup_id() helper")
> Suggested-by: Daniel Borkmann <daniel@...earbox.net>
> Signed-off-by: Yonghong Song <yhs@...com>

Applied to bpf-next, thanks Yonghong!