linux-kernel - Re: PREEMPT_RT_FULL on x86-32 machine

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Message-ID: <20190624132748.n4lgg4swj4nzirdb@linutronix.de>
Date:   Mon, 24 Jun 2019 15:27:48 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Pavel Machek <pavel@....cz>
Cc:     Jan Kiszka <jan.kiszka@...mens.com>,
        linux-rt-users@...r.kernel.org,
        kernel list <linux-kernel@...r.kernel.org>, mwhitehe@...hat.com
Subject: Re: PREEMPT_RT_FULL on x86-32 machine

On 2019-06-24 12:53:40 [+0200], Pavel Machek wrote:
> Hi!
Hi,

> > >Is full preemption supposed to work on x86-32 machines?
> > >
> > >Because it does not work for me. It crashes early in boot, no messages
> > >make it to console. Similar configuration for x86-64 boots ok.
> > >
> > 
> > Maybe you can also tell which version(s) you tried, and in which
> > configuration(s), and how the crash looked like.
> 
> I wanted to know if the configuration is supposed to work at all
> before starting heavy debugging. From your reply I assume that it
> should work.
> 
> I tried 4.19.13-rt1-cip1 among others. Crash is early in boot, I can
> try some early printing...

The latest is v4.19.50-rt22 I would suggest that one. There was a bug
which was fixed either in 4.19.23-rt14 or in the following version.

If the latest one does not work please let me know and I will have a
look.

> Best regards,
> 									Pavel

Sebastian