linux-kernel - Re: [PATCH 0/2] acpi, x86: Add SPCR table support

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Date:   Mon, 11 Dec 2017 15:42:18 +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>
Subject: Re: [PATCH 0/2] acpi, x86: Add SPCR table support


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

> If I disable "Serial Port Console Debug" in my BIOS I still see the SPCR configured:
> 
> [root@...rit-lab ~]# dmesg | grep SPCR
> [    0.000000] ACPI: SPCR 0x0000000069031000 000050 (v01
> 00000000      00000000)
> 
> AFAICT the SPCR is always enabled on some systems.

Fair enough.

> > If so then we should pick up that serial console configuration and activate it, 
> > regardless of any kernel boot options!
> 
> I'm worried about someone who doesn't want a console on ttyS0 suddenly ending up
> with one.  The SPCR could contain incorrect data, etc.

Yeah, that's not good.

Thanks,

	Ingo