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Subject: Re: [PATCH] acpi, spcr: Make SPCR available to x86
To:     Peter Zijlstra <peterz@infradead.org>
References: <20180118150951.28964-1-prarit@redhat.com>
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Cc:     linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
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        Bhupesh Sharma <bhsharma@redhat.com>,
        Lv Zheng <lv.zheng@intel.com>,
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        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        Jonathan Corbet <corbet@lwn.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Timur Tabi <timur@codeaurora.org>, graeme.gregory@linaro.org,
        mark.salter@redhat.com
From:   Prarit Bhargava <prarit@redhat.com>
Message-ID: <3299be7d-66cf-1116-042b-8c68c9b401af@redhat.com>
Date:   Mon, 12 Feb 2018 10:54:41 -0500
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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.