linux-kernel - Re: [PATCH v5] x86: Enable fast strings on Intel if BIOS hasn't already

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Message-ID: <CALCETrXRiZ+5OGauT5bxx0aKMAMmTpO92tjTO9CNfAMOh-VZaA@mail.gmail.com>
Date:	Wed, 1 May 2013 11:18:19 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, Borislav Petkov <bp@...en8.de>,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v5] x86: Enable fast strings on Intel if BIOS hasn't already

On Wed, May 1, 2013 at 10:54 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 05/01/2013 10:50 AM, Andy Lutomirski wrote:
>>
>> Isn't the upper half incompatible with large pages?
>>
>
> No, just with attributes *on the page tables themselves*.

Thanks :)  Now I found the somewhat alarming algorithm in section 4.9.2.

This will be a bit unpleasant, though, since the _PAGE_CACHE_xxx
macros will become rather confused.  I suppose there's no fundamental
reason that pgprot_t has to correspond to pmd bit positions.  Sigh.

--Andy

>
>         -hpa
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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