linux-kernel - Re: [PATCH] acpi, spcr: Make SPCR available to x86

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Date:   Mon, 12 Feb 2018 14:34:29 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, linux-serial@...r.kernel.org,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Lv Zheng <lv.zheng@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Timur Tabi <timur@...eaurora.org>, graeme.gregory@...aro.org,
        mark.salter@...hat.com
Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86

On Thu, Jan 18, 2018 at 10:09:51AM -0500, Prarit Bhargava wrote:
>  config ACPI_SPCR_TABLE
> +	bool "ACPI Serial Port Console Redirection Support"
> +	default y if X86
> +	help
> +	  Enable support for Serial Port Console Redirection (SPCR) Table.
> +	  This table provides information about the configuration of the
> +	  earlycon console.

I just got asked this by oldconfig, which left me rather puzzled, WTF
does this do?