linux-kernel - Re: [RESEND x3][PATCH v12 2/7] locking/mutex: Make mutex::wait

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Message-ID: <20241010100045.321ca4de@gandalf.local.home>
Date: Thu, 10 Oct 2024 10:00:45 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: John Stultz <jstultz@...gle.com>
Cc: LKML <linux-kernel@...r.kernel.org>, Juri Lelli <juri.lelli@...hat.com>,
 Joel Fernandes <joelaf@...gle.com>, Qais Yousef <qyousef@...alina.io>, Ingo
 Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Vincent
 Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann
 <dietmar.eggemann@....com>, Valentin Schneider <vschneid@...hat.com>, Ben
 Segall <bsegall@...gle.com>, Zimuzo Ezeozue <zezeozue@...gle.com>, Mel
 Gorman <mgorman@...e.de>, 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>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 kernel-team@...roid.com, "Connor O'Brien" <connoro@...gle.com>
Subject: Re: [RESEND x3][PATCH v12 2/7] locking/mutex: Make mutex::wait_lock
 irq safe

On Wed,  9 Oct 2024 16:53:35 -0700
John Stultz <jstultz@...gle.com> wrote:

> From: Juri Lelli <juri.lelli@...hat.com>
> 
> mutex::wait_lock might be nested under rq->lock.
> 
> Make it irq safe then.

Can you expand on this please?

If the mutex:wait_lock might be taken under an rq->lock, doesn't that mean
a mutex was taken under rq->lock? Or is it something internal?

This change log needs to be more explicit.

-- Steve