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SubjectRe: [tip:x86/pat] x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability to EMBEDDED
H. Peter Anvin wrote:
> On 10/12/2009 04:10 AM, tip-bot for Arjan van de Ven wrote:
>> Commit-ID: c03cb3149daed3e411657e3212d05ae27cf1a874
>> Gitweb:
>> Author: Arjan van de Ven <>
>> AuthorDate: Sun, 11 Oct 2009 10:33:02 -0700
>> Committer: Ingo Molnar <>
>> CommitDate: Mon, 12 Oct 2009 13:06:57 +0200
>> x86: Relegate CONFIG_PAT and CONFIG_MTRR configurability to EMBEDDED
>> MTRR and PAT support (which got added to CPUs over 10 years ago)
>> are no longer really optional in that more and more things are
>> depending on PAT just working, including various drivers and newer
>> versions of X. (to not even speak of MTRR)
>> Having this as a regular config option just no longer makes sense.
>> This patch relegates CONFIG_X86_PAT to the EMBEDDED category so
>> ultra-embedded can still disable it if they really need to.
> Should we combine this with removing the whitelist (which is largely
> vestigial at this point) and replace it with a blacklist (possibly
> empty)? I still haven't seen any evidence that there are any CPUs which
> have problems, and PAT support go back all the way to Pentium III -- and
> page table attributes can be used all the way back to 386, it just
> excludes the WC type.

I would be in favor of that; other operating systems have been using pat everywhere
since the pII days anyway.

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