linux-kernel - Re: [PATCH v6] perf/arm-dmc620: Fix dmc620_pmu_irqs_lock/cpu_hotplug

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Date:   Wed, 16 Aug 2023 19:25:27 +0100
From:   Will Deacon <will@...nel.org>
To:     Waiman Long <longman@...hat.com>,
        Mark Rutland <mark.rutland@....com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] perf/arm-dmc620: Fix dmc620_pmu_irqs_lock/cpu_hotplug_lock circular lock dependency

On Sat, 12 Aug 2023 19:55:49 -0400, Waiman Long wrote:
> The following circular locking dependency was reported when running
> cpus online/offline test on an arm64 system.
> 
> [   84.195923] Chain exists of:
>                  dmc620_pmu_irqs_lock --> cpu_hotplug_lock --> cpuhp_state-down
> 
> [   84.207305]  Possible unsafe locking scenario:
> 
> [...]

Applied to will (for-next/perf), thanks!

[1/1] perf/arm-dmc620: Fix dmc620_pmu_irqs_lock/cpu_hotplug_lock circular lock dependency
      https://git.kernel.org/will/c/4c1d2f56d685

Cheers,
-- 
Will

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