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

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Message-Id: <160448988356.674824.15131006402948740998.b4-ty@ellerman.id.au>
Date:   Wed,  4 Nov 2020 22:38:32 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     "Paul E . McKenney" <paulmck@...nel.org>, Qian Cai <cai@...hat.com>
Cc:     Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...ts.ozlabs.org,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/smp: Move rcu_cpu_starting() earlier

On Wed, 28 Oct 2020 14:23:34 -0400, Qian Cai wrote:
> 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:
> 
>  WARNING: suspicious RCU usage
>  -----------------------------
>  kernel/locking/lockdep.c:3497 RCU-list traversed in non-reader section!!
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/smp: Call rcu_cpu_starting() earlier
      https://git.kernel.org/powerpc/c/99f070b62322a4b8c1252952735806d09eb44b68

cheers