linux-kernel - how to find thread that fork'd the current

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Message-ID: <CAO6QMdwwJBR8GnpHZo=viA4qj8HN6QOS4+pBQwvHu28E-POnTg@mail.gmail.com>
Date:   Fri, 1 Nov 2019 20:07:20 -0700
From:   Srinivas Murthy <the.srinivas.murthy@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: how to find thread that fork'd the current

>From the current thread (in kernel) is there a way to tell which
thread fork'd it?

systemd -> proc1 --fork--> thread2

thread2 detaches; thread2's parent set to systemd; thread2's tgid set
to its pid;

I see that the detached threads have their tgid set to its own pid and
its parent/real_parent set to the parent systemd

Is there a way to reliably tell the parent proc/thread (proc1) from
thread2's current (task_infostruct)?