Messages in this thread | | | Date | Fri, 6 Oct 2006 10:17:37 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 1/4] LOG2: Implement a general integer log2 facility in the kernel [try #4] |
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On Fri, 6 Oct 2006, Matthew Wilcox wrote:
> On Fri, Oct 06, 2006 at 02:34:14PM +0100, David Howells wrote: > > +config ARCH_HAS_ILOG2_U32 > > + bool > > + default n > > Why not "def_bool n"? Or indeed, since the default is n, why not just > "bool"?
Why so complicated and why do it at all? We already have fls and ffs amoung the bit operations and those map to cpu instructions on arches that support these. fls can be used as a log 2 facilities. If you need another name and further refine it then just add an inline function.
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