linux-kernel - Re: [External] Re: [PATCH 2/2] sched: mark PRINTK_DEFERRED_CONTEXT_MASK in _

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Message-ID: <20200930004852.GA987@jagdpanzerIV.localdomain>
Date:   Wed, 30 Sep 2020 09:48:52 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Chengming Zhou <zhouchengming@...edance.com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        mingo@...hat.com, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, songmuchun@...edance.com,
        john.ogness@...utronix.de
Subject: Re: [External] Re: [PATCH 2/2] sched: mark
 PRINTK_DEFERRED_CONTEXT_MASK in __schedule()

On (20/09/29 17:09), Peter Zijlstra wrote:
> > 2. The registration and unregistration of consoles should not longer
> >    be handled by console_lock (semaphore). It should be possible to
> >    call most consoles without a sleeping lock. It should remove all
> >    these deadlocks between printk() and scheduler().
> 
> I'm confused, who cares about registation? That only happens once at
> boot, right?

You can modprobe or rmmod (register/unregister) netconsole anytime,
for example.

	-ss