linux-kernel - Re: [RFC] [PATCH 10/16] x86

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Message-ID: <455A37B6.2020409@zytor.com>
Date:	Tue, 14 Nov 2006 13:40:06 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Pavel Machek <pavel@...e.cz>, Vivek Goyal <vgoyal@...ibm.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Reloc Kernel List <fastboot@...ts.osdl.org>, akpm@...l.org,
	ak@...e.de, magnus.damm@...il.com, lwang@...hat.com,
	dzickus@...hat.com
Subject: Re: [RFC] [PATCH 10/16] x86_64: 64bit PIC ACPI wakeup

Eric W. Biederman wrote:
> 
>> Why is PGE no longer required, for example?
> 
> PGE is never required.  Especially on a temporary page table.
> PGE is an optimization, to make context switches faster.
> 

You cannot, however, set the Global bit unless PGE is supported by the 
CPU (you'll trap.)

	-hpa
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