linux-kernel - Re: [PATCH] arm64/smp: Move rcu_cpu

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Message-Id: <160404559895.1777248.8248643695413627642.b4-ty@kernel.org>
Date:   Fri, 30 Oct 2020 16:33:25 +0000
From:   Will Deacon <will@...nel.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>, Qian Cai <cai@...hat.com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] arm64/smp: Move rcu_cpu_starting() earlier

On Wed, 28 Oct 2020 14:26:14 -0400, Qian Cai wrote:
> The call to rcu_cpu_starting() in secondary_start_kernel() 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 arm64 (for-next/fixes), thanks!

[1/1] arm64/smp: Move rcu_cpu_starting() earlier
      https://git.kernel.org/arm64/c/ce3d31ad3cac

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev