linux-kernel - Re: [PATCH] powerpc/smp: Move rcu_cpu

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Date:   Thu, 29 Oct 2020 09:48:36 -0400
From:   Qian Cai <cai@...hat.com>
To:     paulmck@...nel.org, Michael Ellerman <mpe@...erman.id.au>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/smp: Move rcu_cpu_starting() earlier

On Wed, 2020-10-28 at 17:31 -0700, Paul E. McKenney wrote:
> On Thu, Oct 29, 2020 at 11:09:07AM +1100, Michael Ellerman wrote:
> > Qian Cai <cai@...hat.com> writes:
> > > The call to rcu_cpu_starting() in start_secondary() is not early enough
> > > in the CPU-hotplug onlining process, which results in lockdep splats as
> > > follows:
> > 
> > Since when?
> > What kernel version?
> > 
> > I haven't seen this running CPU hotplug tests with PROVE_LOCKING=y on
> > v5.10-rc1. Am I missing a CONFIG?
> 
> My guess would be that adding CONFIG_PROVE_RAW_LOCK_NESTING=y will
> get you some splats.

Well, I don't have that set, so it should be CONFIG_PROVE_RCU_LIST=y. Anyway,
this is .config to reproduce on Power9 NV:

https://cailca.coding.net/public/linux/mm/git/files/master/powerpc.config