linux-kernel - Re: [PATCH 12/24] x86-64: remove PGE from must-have feature list

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Date:	Sun, 15 Mar 2009 14:25:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 12/24] x86-64: remove PGE from must-have feature list

H. Peter Anvin wrote:
>> --- a/arch/x86/include/asm/required-features.h
>> +++ b/arch/x86/include/asm/required-features.h
>> @@ -50,7 +50,7 @@
>>  #ifdef CONFIG_X86_64
>>  #define NEED_PSE	0
>>  #define NEED_MSR	(1<<(X86_FEATURE_MSR & 31))
>> -#define NEED_PGE	(1<<(X86_FEATURE_PGE & 31))
>> +#define NEED_PGE	0
>>  #define NEED_FXSR	(1<<(X86_FEATURE_FXSR & 31))
>>  #define NEED_XMM	(1<<(X86_FEATURE_XMM & 31))
>>  #define NEED_XMM2	(1<<(X86_FEATURE_XMM2 & 31))
>>     
>
> This should be conditionalized on CONFIG_PARAVIRT, since doing this
> removes real-hardware optimimizations.
>   

OK.  Can do the same for PSE.

    J
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