linux-kernel - Re: [PATCH RFC] e820_remove

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Message-ID: <4BB17AF6.6090809@kernel.org>
Date:	Mon, 29 Mar 2010 21:15:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH RFC] e820_remove_range fail?

On 03/29/2010 07:08 PM, Rusty Russell wrote:
> Hi Yinghai,
> 
>    I just wrote this patch for lguest, but I think the real problem is
> that e820_remove_range can't split a range.  Is this a problem for
> real machines?
> 
> [    0.000000] BIOS-provided physical RAM map:
> [    0.000000]  LGUEST: 0000000000000000 - 0000000004000000 (usable)
> [    0.000000] Notice: NX (Execute Disable) protection missing in CPU or disabled in BIOS!
> [    0.000000] DMI not present or invalid.
> [    0.000000] last_pfn = 0x3fa0 max_arch_pfn = 0x100000
> [    0.000000] init_memory_mapping: 0000000000000000-0000000003fa0000
> 

you are right, looks like e820_remove_region() missed that case.

will send out one patch.

Thanks

Yinghai Lu
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