linux-kernel - Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin

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Message-ID: <20230626124629.UDvM0W3m@linutronix.de>
Date:   Mon, 26 Jun 2023 14:46:29 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Peter Zijlstra <peterz@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Luis Claudio R. Goncalves" <lgoncalv@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        John Ogness <john.ogness@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Petr Mladek <pmladek@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.com>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking
 in do_write_seqcount_begin_nested()

On 2023-06-26 13:35:39 [+0200], Michal Hocko wrote:
> Is there any reason to backport RT specific fixup to stable trees? I
> mean seriously, is there any actual memory hotplug user using
> PREEMPT_RT? I would be more than curious to hear the usecase.

There is no need for stable backports for RT-only fixes. We have
RT-stable trees for that.
The reason why we fix it in the RT-stable tree is not have something
broken that was known to work.

Sebastian