Re: [PATCH] [RFC] bpf: tracing: new helper bpf_get_current_cgroup_ino

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To: Y Song <ys114321@xxxxxxxxx>
Subject: Re: [PATCH] [RFC] bpf: tracing: new helper bpf_get_current_cgroup_ino
From: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Date: Tue, 22 May 2018 20:35:51 -0700
Cc: Alban Crequy <alban.crequy@xxxxxxxxx>, netdev <netdev@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, containers@xxxxxxxxxxxxxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, Alban Crequy <alban@xxxxxxxxxx>, tj@xxxxxxxxxx
In-reply-to: <CAH3MdRVdfw52atavT3KL8MpPw7zDM_hR6aUcqDP1PogLn_sH+w@mail.gmail.com>
References: <20180513173318.21680-1-alban@kinvolk.io> <20180521162609.lpdrnozowmzdn57m@ast-mbp.dhcp.thefacebook.com> <CAH3MdRWgruVq+3r+2pHTah-c2zTO03vPkepjWDZ0_KrYcroy9A@mail.gmail.com> <CAH3MdRVdfw52atavT3KL8MpPw7zDM_hR6aUcqDP1PogLn_sH+w@mail.gmail.com>
User-agent: NeoMutt/20180223

On Tue, May 22, 2018 at 08:33:24PM -0700, Y Song wrote:
> +       struct cgroup *cgrp = task_dfl_cgroup(current);
> +       if (!cgrp)
> +               return -EINVAL;

why this check is needed?

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  - From: Alban Crequy
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