linux-kernel - Re: [PATCH 2/2] cleanup: convert the int cnt to unsigned long in mm/memblock.c

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Date:	Tue, 22 Nov 2011 15:59:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wang Sheng-Hui <shhuiw@...il.com>
Cc:	yinghai@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cleanup: convert the int cnt to unsigned long in
 mm/memblock.c

On Wed, 09 Nov 2011 13:18:53 +0800
Wang Sheng-Hui <shhuiw@...il.com> wrote:

> @@ -111,7 +112,7 @@ static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_
>  static phys_addr_t __init_memblock memblock_find_base(phys_addr_t size,
>  			phys_addr_t align, phys_addr_t start, phys_addr_t end)
>  {
> -	long i;
> +	unsigned long i;
>  
>  	BUG_ON(0 == size);

This change to memblock_find_base() can cause this loop:

	for (i = memblock.memory.cnt - 1; i >= 0; i--) {

to become infinite under some circumstances.

I stopped reading at that point.  Changes like this require much care.

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