linux-kernel - Re: [PATCH v5] arch/x86: Update config and kernel doc for MPK feature on AMD

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Date:   Tue, 26 May 2020 08:33:36 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Borislav Petkov <bp@...en8.de>, Babu Moger <babu.moger@....com>
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Subject: Re: [PATCH v5] arch/x86: Update config and kernel doc for MPK feature
 on AMD

On 5/23/20 5:21 AM, Borislav Petkov wrote:
>> +config X86_MEMORY_PROTECTION_KEYS
>> +	# Set the "INTEL_"-free option whenever the "INTEL_" one is set.
>> +	# The "INTEL_" one should be removed and replaced by this option
>> +	# after 5.10. This avoids exposing most 'oldconfig' users to this
>> +	# churn.
>> +	def_bool X86_INTEL_MEMORY_PROTECTION_KEYS
> I only picked up the discussion from the sidelines but why do we need
> this at all? If we don't want to have churn, then we can leave it be
> called X86_INTEL_MEMORY_PROTECTION_KEYS, not change the manpage and
> have this depend on CPU_SUP_AMD too so that people can select it on AMD
> machines, and get on with our lives.
> 
> So what's up?

Thanks for pointing that out.  I think this ended up mixing together the
two alternative, which doesn't make much sense.

Babu, let's just leave the config option _naming_ entirely in place.
The only change should be to the dependencies and the description text.