Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()

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To: Michal Hocko <mhocko@xxxxxxxx>
Subject: Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Mon, 26 Jun 2023 14:46:29 +0200
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "Luis Claudio R. Goncalves" <lgoncalv@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Boqun Feng <boqun.feng@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, John Ogness <john.ogness@xxxxxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Waiman Long <longman@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>
In-reply-to: <ZJl4C7aVk3gLLyMs@dhcp22.suse.cz>
References: <20230623171232.892937-1-bigeasy@linutronix.de> <20230623171232.892937-2-bigeasy@linutronix.de> <d9b7c170-ed0d-5d37-e099-20d233115943@I-love.SAKURA.ne.jp> <20230626081254.XmorFrhs@linutronix.de> <0a0c768c-227d-c0cd-1b91-5a884d161c1b@I-love.SAKURA.ne.jp> <20230626104831.GT4253@hirez.programming.kicks-ass.net> <3a4ad958-a9a5-c367-a16d-bd89a173a628@I-love.SAKURA.ne.jp> <ZJl4C7aVk3gLLyMs@dhcp22.suse.cz>

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

References:
- [PATCH v2 0/2] seqlock,mm: lockdep annotation + write_seqlock_irqsave()
  - From: Sebastian Andrzej Siewior
- [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Sebastian Andrzej Siewior
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Tetsuo Handa
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Sebastian Andrzej Siewior
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Tetsuo Handa
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Peter Zijlstra
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Tetsuo Handa
- Re: [PATCH v2 1/2] seqlock: Do the lockdep annotation before locking in do_write_seqcount_begin_nested()
  - From: Michal Hocko

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