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

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Message-ID: <3299be7d-66cf-1116-042b-8c68c9b401af@redhat.com>
Date:   Mon, 12 Feb 2018 10:54:41 -0500
From:   Prarit Bhargava <prarit@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
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 02/12/2018 10:44 AM, Peter Zijlstra wrote:
> On Mon, Feb 12, 2018 at 10:18:06AM -0500, Prarit Bhargava wrote:
>>> But when I specify "earlyprintk=serial,ttyS0,115200" this SPCR crud will
>>> not interfere?
>>>
>>
>> I tested "earlyprintk=serial,ttyS0,115200" on a system which is known to have a
>> functional console with "console=ttyS0,1152008N1" both with and without
>> CONFIG_ACPI_SPCR_TABLE enabled.
> 
> OK, but my point was that SPCR will never override explicit earlyprintk
> stuff. There is absolutely nothing worse than breaking working setups.
> 

Oh, I see.  SPCR will not override earlyprintk config.

P.