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

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Date:   Mon, 2 Aug 2021 08:48:39 +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 2021-07-30 16:52:42 [+0206], John Ogness wrote:
> On 2021-07-30, Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> > I don't have more context but scheduling should work starting with
> > SYSTEM_SCHEDULING.
> 
> I also thought this, but a quick test shows that is not the case. For
> example, init/main.c:kernel_init() is called in preemptible context, but
> msleep() will hang if called at the beginning of that function.

hmm. So the timer device is missing. Everything else is fine.

> John Ogness

Sebastian