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Re: [Xen-devel] [PATCH] arch/x86/xen/setup: Fix for incorrect xen_extra_

To: Daniel Kiper <dkiper@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] arch/x86/xen/setup: Fix for incorrect xen_extra_mem_start initialization ifdef CONFIG_X86_32
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Thu, 12 May 2011 14:58:08 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, stefano.stabellini@xxxxxxxxxxxxx
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On Wed, May 11, 2011 at 10:34:38PM +0200, Daniel Kiper wrote:
> git commit 24bdb0b62cc82120924762ae6bc85afc8c3f2b26 (xen: do not create
> the extra e820 region at an addr lower than 4G) does not take into
> account that ifdef CONFIG_X86_32 instead of e820_end_of_low_ram_pfn()
> find_low_pfn_range() is called (both calls are from arch/x86/kernel/setup.c).
> find_low_pfn_range() behaves correctly and does not require change in
> xen_extra_mem_start initialization. Additionally, if xen_extra_mem_start
> is initialized in the same way as ifdef CONFIG_X86_64 then memory hotplug
> support for Xen balloon driver (under development) is broken.

in linux-next.

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