linux-kernel - Re: [PATCH RT 0/3] riscv: add PREEMPT

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Message-ID: <ZUESqBTSS/s47qM/@xhacker>
Date:   Tue, 31 Oct 2023 22:43:52 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     "Schaffner, Tobias" <tobias.schaffner@...mens.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "minda.chen@...rfivetech.com" <minda.chen@...rfivetech.com>
Subject: Re: [PATCH RT 0/3] riscv: add PREEMPT_RT support

On Tue, Oct 24, 2023 at 08:18:52AM +0200, Sebastian Andrzej Siewior wrote:
> On 2023-10-24 00:40:20 [+0800], Jisheng Zhang wrote:
> > Hi Thomas, Sebastian
> > 
> > could you please review? Any comments are appreciated. or do you want a
> > rebase on linux-6.5.y-rt?
> 
> Please resend on top of latest v6.6-RT. Lazy preempt is gone so only
> PREEMPT_RT config switch remains from your three patch series. If you
> have generic-entry then you could use the new PREEMPT_AUTO.

Hi Sebastian,

Thank you so much for pointing out PREEMPT_AUTO, I read the discussions
last weekend, glad to know PREEMPT_AUTO. And riscv has switched to
generic entry, so it's easy to support PREEMPT_AUTO for riscv. V2 was
sent out a few mintues ago. Could you please review?

> 
> Are there any reports of this booting without warnings with LOCKDEP and
> CONFIG_DEBUG_ATOMIC_SLEEP enabled? I remember there was something
> earlier.

IIRC, Conor reported the warning and stack trace is ext4 related. But
I didn't reproduce the warning. And Schaffner also tried the series
but it seems he didn't see the warning either. So I'm asking for Conor's
help to retry v2.

Thanks
> 
> > Thanks
> 
> Sebastian