linux-kernel - Re: [PATCH RT v2 2/3] sched: migrate_enable: Use sleeping

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Thu, 22 Aug 2019 20:21:34 -0500
From:   Scott Wood <swood@...hat.com>
To:     paulmck@...ux.ibm.com
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joel Fernandes <joel@...lfernandes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>
Subject: Re: [PATCH RT v2 2/3] sched: migrate_enable: Use sleeping_lock to
 indicate involuntary sleep

On Wed, 2019-08-21 at 16:35 -0700, Paul E. McKenney wrote:
> On Wed, Aug 21, 2019 at 06:19:05PM -0500, Scott Wood wrote:
> > Without this, rcu_note_context_switch() will complain if an RCU read
> > lock is held when migrate_enable() calls stop_one_cpu().
> > 
> > Signed-off-by: Scott Wood <swood@...hat.com>
> 
> I have to ask...  Both sleeping_lock_inc() and sleeping_lock_dec() are
> no-ops if not CONFIG_PREEMPT_RT_BASE?

Yes.

-Scott