linux-kernel - Re: [PATCH] firmware/psci: Don't register with debugfs if PSCI isn't available

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Date:   Fri,  6 Jan 2023 17:50:36 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Marc Zyngier <maz@...nel.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Hector Martin <marcan@...can.st>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] firmware/psci: Don't register with debugfs if PSCI isn't available

On Thu, 5 Jan 2023 09:08:34 +0000, Marc Zyngier wrote:
> Contrary to popular belief, PSCI is not a universal property of an
> ARM/arm64 system. There is a garden variety of systems out there
> that don't (or even cannot) implement it.
> 
> I'm the first one deplore such a situation, but hey...
> 
> On such systems, a "cat /sys/kernel/debug/psci" results in
> fireworks, as no invocation callback is registered.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] firmware/psci: Don't register with debugfs if PSCI isn't available
      https://git.kernel.org/arm64/c/cef139299fd8

Cheers,
-- 
Will

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