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

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Message-ID: <5741452f-2a54-4239-a5c3-f13286726780@lunn.ch>
Date: Mon, 24 Jun 2024 17:10:20 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Liu Wei <liuwei09@...tc.cn>
Cc: catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, prarit@...hat.com, will@...nel.org
Subject: Re: [PATCH V3] ACPI: Add acpi=nospcr to disable ACPI SPCR as default
 console on arm64

On Mon, Jun 24, 2024 at 01:04:04PM +0800, Liu Wei wrote:
> From: Andrew Lunn <andrew@...n.ch>
> 
> > 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.
> 
> Thank you for your suggestion. 
> 
> You mean acpi=nospcr_serial or acpi=no_spcrserial? However, it appears 
> somewhat unconventional compared to the original acpi=* parameter.

How about:

nospcr -- disable ACPI SPCR as default _serial_ console on ARM64

Please as Will suggested, add a definition somewhere.

       Andrew