linux-kernel - Re: [RFC PATCH v4 2/3] acpi: apei: Rename ghes_severity() to ghes_cper

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Date:   Fri, 11 May 2018 11:12:24 -0500
From:   "Alex G." <mr.nuke.me@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     alex_gagniuc@...lteam.com, austin_bolen@...l.com,
        shyam_iyer@...l.com, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Schmauss <erik.schmauss@...el.com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        Will Deacon <will.deacon@....com>,
        James Morse <james.morse@....com>,
        Shiju Jose <shiju.jose@...wei.com>,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
        Dongjiu Geng <gengdongjiu@...wei.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org, devel@...ica.org
Subject: Re: [RFC PATCH v4 2/3] acpi: apei: Rename ghes_severity() to
 ghes_cper_severity()

On 05/11/2018 10:58 AM, Borislav Petkov wrote:
> On Fri, May 11, 2018 at 10:45:49AM -0500, Alex G. wrote:
>>
>>
>> On 05/11/2018 10:39 AM, Borislav Petkov wrote:
>>> On Mon, Apr 30, 2018 at 04:33:51PM -0500, Alexandru Gagniuc wrote:
>>>> ghes_severity() is a misnomer in this case, as it implies the severity
>>>> of the entire GHES structure. Instead, it maps one CPER value to a
>>>> monotonically increasing number.
>>>
>>> ... as opposed to CPER severity which is something else or what is this
>>> formulation trying to express?
>>>
>>
>> CPER madness goes like this:
> 
> Let's slow down first. Why is it a "CPER madness"? Maybe this is clear
> in your head but I'm not in it.
> 
>> 	0 - Recoverable
>> 	1 - Fatal
>> 	2 - Corrected
>> 	3 - None
> 
> If you're quoting this:

I'm quoting ACPI 6.2, Table 18-381 Generic Error Data Entry, though I'm
certain they got that from the efi spec.

> enum {
>         CPER_SEV_RECOVERABLE,
>         CPER_SEV_FATAL,
>         CPER_SEV_CORRECTED,
>         CPER_SEV_INFORMATIONAL,
> };
> 
> that last 3 is informational.
> 
>> As you can see, the numbering was created by crackmonkeys. GHES_* is an
>> internal enum that goes up in order of severity, as you'd expect.
> 
> So what are you trying to tell me - that those CPER numbers are not
> increasing?!
> 
> Why does that even matter?

Because the GHES structure uses CPER values, but all the code is written
to use GHES_SEV_ values. GHES_SEV_ is a made up enum, specifically for
linux.

Sure, the return in ghes_sec_pcie_severity() should say
GHES_SEV_RECOVERABLE, but that is a Freudian slip rather than
intentional typing. Thank you for catching that :)

Alex