linux-kernel - Re: [PATCH REPOST REPOST v2] fscache: Use only one fscache_object_cong

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Message-Id: <20211226162030.fc5340c2278c95342690467d@linux-foundation.org>
Date:   Sun, 26 Dec 2021 16:20:30 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org,
        linux-cachefs@...hat.com, linux-fsdevel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>, Gregor Beck <gregor.beck@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH REPOST REPOST v2] fscache: Use only one
 fscache_object_cong_wait.

On Thu, 23 Dec 2021 19:15:09 +0100 Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> On 2021-12-23 17:17:09 [+0000], David Howells wrote:
> > Thanks, but this is gone in the upcoming fscache rewrite.  I'm hoping that
> > will get in the next merge window.
> 
> Yes, I noticed that. What about current tree, v5.16-rc6 and less?
> Shouldn't this be addressed?

If the bug is serious enough to justify a -stable backport then yes, we
should merge a fix such as this ahead of the fscache rewrite, so we
have something suitable for backporting.

Is the bug serious enough?

Or is the bug in a not-yet-noticed state?  In other words, is it
possible that four years from now, someone will hit this bug in a
5.15-based kernel and will then wish we'd backported a fix?