linux-kernel - Re: [PATCH V3] ACPI: Add acpi=nospcr to disable ACPI SPCR as default console on arm64

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Date: Sat, 22 Jun 2024 19:05:02 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Liu Wei <liuwei09@...tc.cn>
Cc: prarit@...hat.com, catalin.marinas@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	will@...nel.org
Subject: Re: [PATCH V3] ACPI: Add acpi=nospcr to disable ACPI SPCR as default
 console on arm64

On Sat, Jun 22, 2024 at 05:35:21PM +0800, Liu Wei wrote:
> For varying privacy and security reasons, sometimes we would like to
> completely silence the serial console, and only enable it when needed.
> 
> But there are many existing systems that depend on this console,
> so add acpi=nospcr for this situation.

Maybe it is just me, but i see nospcr and my brain expands it to "no
speaker". Adding to that, your commit message says "completely
silence"...

> +			nospcr -- disable ACPI SPCR as default console on ARM64
> +			For ARM64, ONLY "acpi=off", "acpi=on", "acpi=force" or
> +			"acpi=nospcr" are available
> +			For RISCV64, ONLY "acpi=off", "acpi=on" or "acpi=force"
> +			are available

How about putting the word 'serial' in here somewhere, just to give
users an additional clue you are not talking about a speaker, CTRL-G
etc.

	Andrew