linux-kernel - Re: [PATCH] avoid negative (and full-width) shifts in radix-tree.c, take 3

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Message-ID: <Pine.LNX.4.64.0708291048250.21332@schroedinger.engr.sgi.com>
Date:	Wed, 29 Aug 2007 10:49:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Lund <firefly@...64.dk>
cc:	Christoph Hellwig <hch@...radead.org>, trivial@...nel.org,
	linux-kernel@...r.kernel.org, Momchil Velikov <velco@...ata.bg>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH] avoid negative (and full-width) shifts in radix-tree.c,
 take 3

On Wed, 29 Aug 2007, Peter Lund wrote:

>  
> -	if (tmp >= RADIX_TREE_INDEX_BITS)
> -		index = ~0UL;
> -	return index;
> +	if (shift < 0)
> +		return ~0UL;
> +	if (shift >= 8 * sizeof(unsigned long))

8* sizeof(unsigned long) is the constant BITS_PER_LONG.
-
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