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

[Björn Steinbrink]

On 2007.08.29 10:49:12 -0700, Christoph Lameter wrote:
> 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.

Or in this context: RADIX_TREE_INDEX_BITS, which happens to be the old
check, which just needed to be extended to cover negative shifts.

Björn
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