linux-kernel - Re: [PATCH v2] console: Add console=auto option

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Date:   Fri, 17 Aug 2018 18:38:28 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Mark Salter <msalter@...hat.com>,
        Al Stone <ahs3@...hat.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        x86@...nel.org, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2] console: Add console=auto option

On (08/16/18 13:39), Prarit Bhargava wrote:
>
> +		auto	[X86] Enable ACPI SPCR console
			^^^^
			And arm64?

Any chance we can rename param to "spcr" or something more clear?
To explicitly state what exactly it's going to do. `auto' sounds
too general and doesn't tell me that much. I'm probably the only
here who can't see a connection between "auto" and "SPCR", but
still.

One more thing, as far as I can tell, acpi_parse_spcr() can fail
and return an error. arch_console_setup() hides all errors and
returns void. Should it return error code?

	int arch_console_setup(void)
	{
		return acpi_parse_spcr(false, true);
	}

Or maybe

	void arch_console_setup(void)
	{
		if (acpi_parse_spcr(false, true))
			pr_err(.........);
	}

There can be other consoles in the system, logging an error is not
such a useless thing.

	-ss