linux-kernel - Re: [PATCH v2] x86: Fix adjust_range_size

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Date:	Fri, 31 May 2013 13:34:41 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: Fix adjust_range_size_mask calling position


* Yinghai Lu <yinghai@...nel.org> wrote:

> Commit 8d57470d cause a kernel panic while setting mem=2G.
>      [mem 0x00000000-0x000fffff] page 4k
>      [mem 0x7fe00000-0x7fffffff] page 1G
>      [mem 0x7c000000-0x7fdfffff] page 1G
>      [mem 0x00100000-0x001fffff] page 4k
>      [mem 0x00200000-0x7bffffff] page 2M
> 
> for last entry is not what we want, we should have
>      [mem 0x00200000-0x3fffffff] page 2M
>      [mem 0x40000000-0x7bffffff] page 1G

What this changelog does not mention, why does the erroneous entry result 
in a kernel panic? It looks like a valid range, so a crash is unexpected.

(This is worth explaining, even if the fix for that is in a separate 
patch.)

Thanks,

	Ingo
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