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

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Message-ID: <4ECCEEA8.3030002@gmail.com>
Date:	Wed, 23 Nov 2011 21:01:28 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 2011年11月23日 07:59, Andrew Morton wrote:
> 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.
> 

Got it.

Thanks for your instructions. 
I'll review the code and may resubmit the right patches later.

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