On Monday 08 December 2008 08:20:59 Geert Uytterhoeven wrote:
> On Fri, 5 Dec 2008, Rusty Russell wrote:
> > +static inline int __fls(int x)
> ^^^ ^^^
> Other implementations take `unsigned long' and return `unsigned long'...
It's all over the place, actually. 32 bit archs are especially loose.
I've been toying with the idea of a boottime testsuite for all the
bitops to see who gets them wrong.
> > +static inline int __fls(unsigned long word)
> ^^^ ^^^^^^^^^^^^^
> > +{
> > + return fls(word) - 1;
> > +}
> > +
>
> ... but this one uses mixed types?
I cut and pasted. I thought you were 32 bit, so doesn't matter?
> What are the official semantics of __fls()?
Find last bit set in the word, undefined if word is 0. Returns 0
to BITS_PER_LONG-1.
Cheers,
Rusty.
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