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

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Message-ID: <87zls3qhop.fsf@saeurebad.de>
Date:	Wed, 09 Apr 2008 15:30:30 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Roel Kluin <12o3l@...cali.nl>
Cc:	linux-mm@...ck.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pagewalk: don't pte_unmap(NULL) in walk_pte_range()

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.

	Hannes
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