linux-kernel - [PATCH v2 0/2] seqlock,mm: lockdep annotation + write_seqlock

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Message-Id: <20230623171232.892937-1-bigeasy@linutronix.de>
Date:   Fri, 23 Jun 2023 19:12:30 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     "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>,
        Michal Hocko <mhocko@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.co>, Will Deacon <will@...nel.org>
Subject: [PATCH v2 0/2] seqlock,mm: lockdep annotation + write_seqlock_irqsave()

Hi,

this has been a single patch (2/2) but then it was pointed out that the
lockdep annotation in seqlock needs to be adjusted to fully close the
printk window so that there is no printing after the seq-lock has been
acquired and before printk_deferred_enter() takes effect.

I'm sending both patches in this series so both sides (locking and mm)
are aware of the situation. 
I hope that both patches can be applied independently via their subsystem
tree (the lockdep splat + deadlock is low risk).

The original thread starts at
	https://lore.kernel.org/20230621104034.HT6QnNkQ@linutronix.de

Sebastian