linux-kernel - Re: [PATCH][RFC] ipc,fs: use rcu_work to free struct ipc

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Date:   Fri, 18 Feb 2022 03:29:56 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Rik van Riel <riel@...riel.com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        Chris Mason <clm@...com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        linux-fsdevel@...r.kernel.org,
        Giuseppe Scrivano <gscrivan@...hat.com>
Subject: Re: [PATCH][RFC] ipc,fs: use rcu_work to free struct ipc_namespace

On Thu, Feb 17, 2022 at 03:36:20PM -0500, Rik van Riel wrote:
> The patch works, but a cleanup question for Al Viro:
> 
> How do we get rid of #include "../fs/mount.h" and the raw ->mnt_ns = NULL thing
> in the cleanest way?

Hell knows...  mnt_make_shortterm(mnt) with big, fat warning along the lines of
"YOU MUST HAVE AN RCU GRACE PERIOD BEFORE YOU DROP THAT REFERENCE!!!", perhaps?