linux-kernel - Re: [PATCH] locking/mutex: Mark racy reads of owner->on

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Message-ID: <87ee6ac3j4.ffs@tglx>
Date:   Fri, 17 Dec 2021 22:41:51 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Waiman Long <longman@...hat.com>, Marco Elver <elver@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org
Cc:     kasan-dev@...glegroups.com, Mark Rutland <mark.rutland@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH] locking/mutex: Mark racy reads of owner->on_cpu

On Thu, Dec 02 2021 at 10:46, Waiman Long wrote:
> On 12/2/21 06:53, Marco Elver wrote:
> I would like to see owner_on_cpu() extracted out from 
> kernel/locking/rwsem.c into include/linux/sched.h right after 
> vcpu_is_preempted(), for instance, and with READ_ONCE() added. Then it 
> can be used in mutex.c as well. This problem is common to both mutex and 
> rwsem.

And rtmutex.c