On Friday 20 July 2012, David Howells wrote:
>
> Arnd Bergmann <[email protected]> wrote:
>
> > I don't generally like to put stuff into asm-generic when it's unlikely
> > to be overridden by architectures. It would really belong into
> > include/linux, but then again we have all the other bitops in asm-generic
> > as well, so whatever...
>
> Some arches (such as Sparc, I think) have count-leading-zero instructions.
But I guess they would still use the same definition of
+static inline int count_leading_zeros(unsigned long x)
+{
+ if (sizeof(x) == 4)
+ return BITS_PER_LONG - fls(x);
+ else
+ return BITS_PER_LONG - fls64(x);
+}
and just provide their own fls().
Arnd
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