linux-kernel - Re: bootmem: Double freeing a PFN on nodes spanning other nodes

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Date:	Mon, 19 May 2008 03:31:10 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MM Mailing List <linux-mm@...ck.org>
Subject: Re: bootmem: Double freeing a PFN on nodes spanning other nodes

KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:

> On Sat, 17 May 2008 00:30:55 +0200
> Johannes Weiner <hannes@...urebad.de> wrote:
>
>> Hi,
>> 
>> When memory nodes overlap each other, the bootmem allocator is not aware
>> of this and might pass the same page twice to __free_pages_bootmem().
>> 
>
> 1. init_bootmem_node() is called against a node, [start, end). After this,
>    all pages are 'allocated'.
> 2. free_bootmem_node() is called against available memory in a node.
> 3. bootmem allocator is ready.
>
> memory overlap seems not to be trouble while an arch's code calls
> free_bootmem_node() correctly.

Ah, I totally overlooked that one.  Thank you very much!

	Hannes
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