linux-kernel - Re: [RESEND][PATCH v9 2/7] locking/mutex: Make mutex::wait

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Date: Tue, 09 Apr 2024 18:12:26 +0200
From: Valentin Schneider <vschneid@...hat.com>
To: John Stultz <jstultz@...gle.com>, LKML <linux-kernel@...r.kernel.org>
Cc: Juri Lelli <juri.lelli@...hat.com>, Joel Fernandes <joelaf@...gle.com>,
 Qais Yousef <qyousef@...gle.com>, Ingo Molnar <mingo@...hat.com>, Peter
 Zijlstra <peterz@...radead.org>, Vincent Guittot
 <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Zimuzo Ezeozue <zezeozue@...gle.com>, Youssef Esmat
 <youssefesmat@...gle.com>, Mel Gorman <mgorman@...e.de>, Daniel Bristot de
 Oliveira <bristot@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long
 <longman@...hat.com>, Boqun Feng <boqun.feng@...il.com>, "Paul E.
 McKenney" <paulmck@...nel.org>, Metin Kaya <Metin.Kaya@....com>, Xuewen
 Yan <xuewen.yan94@...il.com>, K Prateek Nayak <kprateek.nayak@....com>,
 Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com, Connor
 O'Brien <connoro@...gle.com>, John Stultz <jstultz@...gle.com>
Subject: Re: [RESEND][PATCH v9 2/7] locking/mutex: Make mutex::wait_lock irq
 safe

On 01/04/24 16:44, John Stultz wrote:
> From: Juri Lelli <juri.lelli@...hat.com>
>
> mutex::wait_lock might be nested under rq->lock.
>
> Make it irq safe then.
>
> Cc: Joel Fernandes <joelaf@...gle.com>
> Cc: Qais Yousef <qyousef@...gle.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Juri Lelli <juri.lelli@...hat.com>
> Cc: Vincent Guittot <vincent.guittot@...aro.org>
> Cc: Dietmar Eggemann <dietmar.eggemann@....com>
> Cc: Valentin Schneider <vschneid@...hat.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ben Segall <bsegall@...gle.com>
> Cc: Zimuzo Ezeozue <zezeozue@...gle.com>
> Cc: Youssef Esmat <youssefesmat@...gle.com>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Waiman Long <longman@...hat.com>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Metin Kaya <Metin.Kaya@....com>
> Cc: Xuewen Yan <xuewen.yan94@...il.com>
> Cc: K Prateek Nayak <kprateek.nayak@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: kernel-team@...roid.com
> Tested-by: K Prateek Nayak <kprateek.nayak@....com>

Reviewed-by: Valentin Schneider <vschneid@...hat.com>

> Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> [rebase & fix {un,}lock_wait_lock helpers in ww_mutex.h]
> Signed-off-by: Connor O'Brien <connoro@...gle.com>
> Signed-off-by: John Stultz <jstultz@...gle.com>