linux-kernel - Re: [PATCH v7 4/7] sched/core: Prevent race condition between cpuset and __sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20190405125315.GC5453@localhost.localdomain>
Date:   Fri, 5 Apr 2019 14:53:15 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...hat.com, rostedt@...dmis.org, tj@...nel.org,
        linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, lizefan@...wei.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v7 4/7] sched/core: Prevent race condition between cpuset
 and __sched_setscheduler()

Hi,

On 05/04/19 14:36, Peter Zijlstra wrote:
> On Wed, Apr 03, 2019 at 10:46:47AM +0200, Juri Lelli wrote:
> > +static inline void cpuset_read_only_lock(unsigned long *flags)
> > +{
> > +	local_irq_save(*flags);
> > +	preempt_disable();
> > +}
> > +
> > +static inline void cpuset_read_only_unlock(unsigned long *flags)
> > +{
> > +	local_irq_restore(*flags);
> > +	preempt_enable();
> > +}
> 
> You can ditch the preempt stuff. IRQs disabled already very much implies
> !preemptible.

OK.

Thanks,

- Juri