linux-kernel - Re: [PATCH v2 2/2] acpi, x86: Use SPCR table for earlycon on x86

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Date:   Tue, 12 Dec 2017 11:41:14 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Prarit Bhargava <prarit@...hat.com>
Cc:     linux-acpi@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...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>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Timur Tabi <timur@...eaurora.org>
Subject: Re: [PATCH v2 2/2] acpi, x86: Use SPCR table for earlycon on x86


* Prarit Bhargava <prarit@...hat.com> wrote:

> The ACPI SPCR code has been used to define an earlycon console for ARM64
> and can be used for x86.
> 
> Modify the ACPI SPCR parsing code to account for console behaviour
> differences between ARM64 and x86.  Initialize the SPCR code from
> x86 ACPI initialization code.
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>
> Cc: linux-doc@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-pm@...r.kernel.org
> Cc: linux-acpi@...r.kernel.org
> Cc: linux-serial@...r.kernel.org
> Cc: Bhupesh Sharma <bhsharma@...hat.com>
> Cc: Lv Zheng <lv.zheng@...el.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Timur Tabi <timur@...eaurora.org>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 3 +++
>  arch/arm64/kernel/acpi.c                        | 2 +-
>  arch/x86/kernel/acpi/boot.c                     | 4 ++++
>  drivers/acpi/Kconfig                            | 2 +-
>  drivers/acpi/spcr.c                             | 7 +++++--
>  include/linux/acpi.h                            | 7 +++++--
>  6 files changed, 19 insertions(+), 6 deletions(-)

LGTM from an x86 perspective:

  Acked-by: Ingo Molnar <mingo@...nel.org>

(assuming it causes no regressions in linux-next.)

Since patch #1 affects ARM64 significantly, once that patch is acceptable to the 
arm64 folks feel free to upstream this second patch via the ARM64 tree as well.

Thanks,

	Ingo