linux-kernel - Re: [PATCH] x86/i386: Check PSE bit before using PAGE_KERNEL

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Message-ID: <4FC7D2AE.9080603@zytor.com>
Date:	Thu, 31 May 2012 13:21:02 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	konrad@...nok.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	mingo@...hat.com, tglx@...utronix.de, stable@...nel.org
Subject: Re: [PATCH] x86/i386: Check PSE bit before using PAGE_KERNEL_LARGE.

On 05/31/2012 12:40 PM, Konrad Rzeszutek Wilk wrote:
> During bootup we would unconditionally do this on any
> machine that was built with CONFIG_NUMA=y on i386:
> 
> setup_arch
>   \-initmem_init
>       \-x86_numa_init (with dummy_init as callback)
>           \- init_alloc_remap
>                \- set_pmd_pfn (with PAGE_PSE)
> 
> without checking to see if the CPU supports PSE. This
> patch adds that and also allows the init_alloc_remap function
> to properly work by falling back on PTEs.
> 

Well, the code looks like it is PAE-specific, and PAE implies PSE.

Xen breaks that, but that is a divergence of Xen from x86.

	-hpa



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