linux-kernel - Re: [PATCH] [RFC] bpf: tracing: new helper bpf_get_current_cgroup

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Message-ID: <20180523033550.z3tqo4lhd3zrmtdu@ast-mbp>
Date:   Tue, 22 May 2018 20:35:51 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Y Song <ys114321@...il.com>
Cc:     Alban Crequy <alban.crequy@...il.com>,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
        containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
        Alban Crequy <alban@...volk.io>, tj@...nel.org
Subject: Re: [PATCH] [RFC] bpf: tracing: new helper bpf_get_current_cgroup_ino

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?