linux-kernel - Re: [PREEMPT_RT][PATCH] printk: Enhance the condition check of msleep in pr

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Date:   Fri, 30 Jul 2021 16:01:43 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     chao.qin@...el.com, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org, tglx@...utronix.de,
        rostedt@...dmis.org, mgross@...ux.intel.com, paul.mei@...el.com,
        lili.li@...el.com
Subject: Re: [PREEMPT_RT][PATCH] printk: Enhance the condition check of
 msleep in pr_flush()

On 2021-07-19 17:01:51 [+0206], John Ogness wrote:
> On 2021-07-19, chao.qin@...el.com wrote:
> > --- a/kernel/printk/printk.c
> > +++ b/kernel/printk/printk.c
> > @@ -3620,7 +3620,8 @@ bool pr_flush(int timeout_ms, bool reset_on_progress)
> >  	u64 diff;
> >  	u64 seq;
> >  
> > -	may_sleep = (preemptible() && !in_softirq());
> > +	may_sleep = (preemptible() && !in_softirq()
> > +			&& (system_state >= SYSTEM_RUNNING));

I don't have more context but scheduling should work starting with
SYSTEM_SCHEDULING.

> >  
> >  	seq = prb_next_seq(prb);
> >  
> >

Sebastian