linux-kernel - Re: [mm] 408579cd62: WARNING:suspicious_RCU

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Message-ID: <86zg4cx2tq.wl-maz@kernel.org>
Date:   Mon, 03 Jul 2023 19:33:21 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Palmer Dabbelt <palmer@...osinc.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Conor Dooley <conor@...nel.org>, apatel@...tanamicro.com,
        oliver.sang@...el.com, Liam.Howlett@...cle.com,
        linux-kernel@...r.kernel.org, lkp@...ts.01.org, lkp@...el.com
Subject: Re: [mm] 408579cd62: WARNING:suspicious_RCU_usage

On Mon, 03 Jul 2023 19:11:27 +0100,
Palmer Dabbelt <palmer@...osinc.com> wrote:
> 
> On Mon, 03 Jul 2023 10:46:55 PDT (-0700), Linus Torvalds wrote:
> > On Mon, 3 Jul 2023 at 10:34, Marc Zyngier <maz@...nel.org> wrote:
> >> 
> >> Comparing with what we do on arm64, a less radical change would be to
> >> move the IPI init after notify_cpu_starting(), which explicitly
> >> enables RCU usage.
> > 
> > Ack, that looks right to me.
> 
> I don't see anything wrong with it and it's passing my tests, but
> we've got a handful of ways to boot so it's all a bit messy and I
> might be messing something.
> 
> I'm still catching up a bit as I took both days off this weekend.
> Hopefully just an oversight in a bigger rafactoring, but I'll give it
> another look.
> 
> Marc: are you going to send that as a patch?

Just did [1].

Thanks,

	M.

[1] https://lore.kernel.org/r/20230703183126.1567625-1-maz@kernel.org

-- 
Without deviation from the norm, progress is not possible.