linux-kernel - Re: [LV] [PATCH] avoid negative shifts in radix-tree.c

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Message-ID: <20070826160125.GQ11718@lug-owl.de>
Date:	Sun, 26 Aug 2007 18:01:25 +0200
From:	Jan-Benedict Glaw <jbglaw@...-owl.de>
To:	Peter Firefly Lund <firefly@...64.dk>
Cc:	Christoph Lameter <clameter@....com>,
	Christoph Hellwig <hch@...radead.org>, trivial@...nel.org,
	linux-kernel@...r.kernel.org, Momchil Velikov <velco@...ata.bg>
Subject: Re: [LV] [PATCH] avoid negative shifts in radix-tree.c

On Sat, 2007-08-25 16:26:07 +0200, Peter Firefly Lund <firefly@...64.dk> wrote:
> --- lib/radix-tree-old.c	2007-08-25 15:36:40.000000000 +0200
> +++ lib/radix-tree.c	2007-08-25 15:36:51.000000000 +0200
> @@ -980,12 +980,14 @@ radix_tree_node_ctor(void *node, struct 
>  
>  static __init unsigned long __maxindex(unsigned int height)
>  {
> -	unsigned int tmp = height * RADIX_TREE_MAP_SHIFT;
> -	unsigned long index = (~0UL >> (RADIX_TREE_INDEX_BITS - tmp - 1)) >> 1;
> -
> -	if (tmp >= RADIX_TREE_INDEX_BITS)
> -		index = ~0UL;
> -	return index;
> +	unsigned int	tmp   = 
> +	int shift = RADIX_TREE_INDEX_BITS - height * RADIX_TREE_MAP_SHIFT;
> +	unsigned long	index;
> +
> +	if (shift < 0)
> +		return ~0UL;
> +	else
> +		return ~0UL >> shift;
>  }
>  
>  static __init void radix_tree_init_maxindex(void)

`index' seems to be unused now?  And indention does neither follow
kernel coding style, nor this file's style. You'd also hammer out
`tmp' and put its initializer right there where it's used.

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@...-owl.de              +49-172-7608481
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