linux-kernel - Re: [PATCH RESEND v7 02/21] drivers/perf: apple_m1: Only init PMUv3 remap when EL2 is available

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Message-ID: <aHUeNpx6bsC5Gk3b@willie-the-truck>
Date: Mon, 14 Jul 2025 16:11:50 +0100
From: Will Deacon <will@...nel.org>
To: Nick Chan <towinchenmi@...il.com>
Cc: Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Janne Grunau <j@...nau.net>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, Sven Peter <sven@...nel.org>,
	Marc Zyngier <maz@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org,
	asahi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v7 02/21] drivers/perf: apple_m1: Only init PMUv3
 remap when EL2 is available

On Mon, Jun 16, 2025 at 09:31:51AM +0800, Nick Chan wrote:
> Skip initialization of PMUv3 remap when EL2 is not available.
> Initialization is harmless in EL1 but it is still a weird thing to do.

Why is that weird?

Will