linux-kernel - Re: [PATCH 1/1] memblock, memhotplug: Fix wrong type in memblock_find_in_range

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Date:	Tue, 12 Aug 2014 15:03:04 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	<santosh.shilimkar@...com>, <grygorii.strashko@...com>,
	<phacht@...ux.vnet.ibm.com>, <yinghai@...nel.org>,
	<fabf@...net.be>, <Emilian.Medve@...escale.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] memblock, memhotplug: Fix wrong type in
 memblock_find_in_range_node().

On Sun, 10 Aug 2014 14:12:03 +0800 Tang Chen <tangchen@...fujitsu.com> wrote:

> In memblock_find_in_range_node(), we defeind ret as int. But it shoule
> be phys_addr_t because it is used to store the return value from
> __memblock_find_range_bottom_up().
> 
> The bug has not been triggered because when allocating low memory near
> the kernel end, the "int ret" won't turn out to be minus. When we started
> to allocate memory on other nodes, and the "int ret" could be minus.
> Then the kernel will panic.
> 
> A simple way to reproduce this: comment out the following code in numa_init(),
> 
>         memblock_set_bottom_up(false);
> 
> and the kernel won't boot.

Which kernel versions need this fix?
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