Messages in this thread | | | Date | Tue, 06 Mar 2007 10:51:27 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] Fix get_order() [try #2] |
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David Howells wrote: > H. Peter Anvin <hpa@zytor.com> 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.
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