Re: [PATCH] Fix get_order() [try #2]

[H. Peter Anvin]

David Howells wrote:
> H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> > Why not just make it ((n) < 1 ? 0 : ...) and make it well-defined for
> > n == 0?
>
> Because log2(0) is -INF or mathematically undefined or something isn't it?

Yes, but it's a *rounding up* function.  In this case, it makes sense to 
round up 0 to 1.  This is, in fact, a common way to handle requests for 
zero-byte allocation in order to be able to return a unique address for 
each one, so it's not a spurious thing.

	-hpa
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