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From: Valentin Schneider <vschneid@redhat.com>
To: John Stultz <jstultz@google.com>, LKML <linux-kernel@vger.kernel.org>
Cc: Juri Lelli <juri.lelli@redhat.com>, Joel Fernandes <joelaf@google.com>,
 Qais Yousef <qyousef@google.com>, Ingo Molnar <mingo@redhat.com>, Peter
 Zijlstra <peterz@infradead.org>, Vincent Guittot
 <vincent.guittot@linaro.org>, Dietmar Eggemann <dietmar.eggemann@arm.com>,
 Steven Rostedt <rostedt@goodmis.org>, Ben Segall <bsegall@google.com>,
 Zimuzo Ezeozue <zezeozue@google.com>, Youssef Esmat
 <youssefesmat@google.com>, Mel Gorman <mgorman@suse.de>, Daniel Bristot de
 Oliveira <bristot@redhat.com>, Will Deacon <will@kernel.org>, Waiman Long
 <longman@redhat.com>, Boqun Feng <boqun.feng@gmail.com>, "Paul E.
 McKenney" <paulmck@kernel.org>, Metin Kaya <Metin.Kaya@arm.com>, Xuewen
 Yan <xuewen.yan94@gmail.com>, K Prateek Nayak <kprateek.nayak@amd.com>,
 Thomas Gleixner <tglx@linutronix.de>, kernel-team@android.com, Connor
 O'Brien <connoro@google.com>, John Stultz <jstultz@google.com>
Subject: Re: [RESEND][PATCH v9 2/7] locking/mutex: Make mutex::wait_lock irq
 safe
In-Reply-To: <20240401234439.834544-3-jstultz@google.com>
References: <20240401234439.834544-1-jstultz@google.com>
 <20240401234439.834544-3-jstultz@google.com>
Date: Tue, 09 Apr 2024 18:12:26 +0200
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On 01/04/24 16:44, John Stultz wrote:
> From: Juri Lelli <juri.lelli@redhat.com>
>
> mutex::wait_lock might be nested under rq->lock.
>
> Make it irq safe then.
>
> Cc: Joel Fernandes <joelaf@google.com>
> Cc: Qais Yousef <qyousef@google.com>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Juri Lelli <juri.lelli@redhat.com>
> Cc: Vincent Guittot <vincent.guittot@linaro.org>
> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
> Cc: Valentin Schneider <vschneid@redhat.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Ben Segall <bsegall@google.com>
> Cc: Zimuzo Ezeozue <zezeozue@google.com>
> Cc: Youssef Esmat <youssefesmat@google.com>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Waiman Long <longman@redhat.com>
> Cc: Boqun Feng <boqun.feng@gmail.com>
> Cc: "Paul E. McKenney" <paulmck@kernel.org>
> Cc: Metin Kaya <Metin.Kaya@arm.com>
> Cc: Xuewen Yan <xuewen.yan94@gmail.com>
> Cc: K Prateek Nayak <kprateek.nayak@amd.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: kernel-team@android.com
> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>

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

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