linux-kernel - Re: [PATCH 28/46] x86, mm: Add pointer about Xen mmu requirement for alloc_low

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Date:	Tue, 13 Nov 2012 16:38:55 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 28/46] x86, mm: Add pointer about Xen mmu requirement
 for alloc_low_pages

On Mon, 12 Nov 2012, Yinghai Lu wrote:
> From: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> Add link to commit 279b706 for more information
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>

ah, here it is, OK then

>  arch/x86/mm/init.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index f5e0120..a7939ed 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -25,6 +25,11 @@ unsigned long __meminitdata pgt_buf_top;
>  
>  static unsigned long min_pfn_mapped;
>  
> +/*
> + * Pages returned are already directly mapped.
> + *
> + * Changing that is likely to break Xen, see commit 279b706 for detail info.
                                                                    ^detailed

> + */
>  __ref void *alloc_low_pages(unsigned int num)
>  {
>  	unsigned long pfn;
> -- 
> 1.7.7
> 
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