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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