linux-kernel - Re: [PATCH] pagewalk: don't pte_unmap(NULL) in walk_pte

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Date:	Thu, 10 Apr 2008 13:42:52 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	Johannes Weiner <hannes@...urebad.de>
CC:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pagewalk: don't pte_unmap(NULL) in walk_pte_range()

Johannes Weiner wrote:
> Hi,
> 
> Roel Kluin <12o3l@...cali.nl> writes:
> 
>> This is right isn't it?
>> ---
>> Don't pte_unmap a NULL pointer, but the previous.
> 
> Which NULL pointer?
> 
>> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
>> ---
>> diff --git a/mm/pagewalk.c b/mm/pagewalk.c
>> index 1cf1417..6615f0b 100644
>> --- a/mm/pagewalk.c
>> +++ b/mm/pagewalk.c
>> @@ -15,7 +15,7 @@ static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
>>  		       break;
>>  	} while (pte++, addr += PAGE_SIZE, addr != end);
>>  
>> -	pte_unmap(pte);
>> +	pte_unmap(pte - 1);
>>  	return err;
>>  }
> 
> This does not make any sense to me.

you are right, please ignore.

> 	Hannes

thanks,

Roel
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