linux-kernel - Re: [PATCH 3/4] tty: Iterate only thread group leaders in __do

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Message-ID: <20180111183412.GA18725@redhat.com>
Date:   Thu, 11 Jan 2018 19:34:13 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        jslaby@...e.com, viro@...iv.linux.org.uk, keescook@...omium.org,
        serge@...lyn.com, james.l.morris@...cle.com, luto@...nel.org,
        john.johansen@...onical.com, mingo@...nel.org,
        akpm@...ux-foundation.org, mhocko@...e.com, peterz@...radead.org
Subject: Re: [PATCH 3/4] tty: Iterate only thread group leaders in __do_SAK()

On 01/11, Kirill Tkhai wrote:
>
> Since threads can't have additional fd in comparison
> to thread group leader
...
> as they definitely have the same
> files struct, as thread group leader.

Hmm. Why? Iirc CLONE_THREAD doesn't require CLONE_FILES?

Also. The group leader can exit, in this case its ->files == NULL
but other threads can be alive.

Oleg.