Messages in this thread | | | Date | Tue, 06 Nov 2007 20:11:50 +0200 | From | Boaz Harrosh <> | Subject | Re: [PATCH] Add the macro to test if "exactly_one_bit_set" to log2.h. |
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On Tue, Nov 06 2007 at 18:38 +0200, "Robert P. J. Day" <rpjday@crashcourse.ca> wrote: > While this macro is defined in terms of "is_power_of_2" and is > therefore functionally equivalent, the visual semantics are sometimes > more appropriate for what is actually being tested. > > Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> > > --- > > diff --git a/include/linux/log2.h b/include/linux/log2.h > index c8cf5e8..d0d324e 100644 > --- a/include/linux/log2.h > +++ b/include/linux/log2.h > @@ -55,6 +55,12 @@ bool is_power_of_2(unsigned long n) > } > > /* > + * And for folks who want slightly different semantics ... > + */ > + > +#define exactly_one_bit_set is_power_of_2
at_most_one_bit_set No? > + > +/* > * round up to nearest power of two > */ > static inline __attribute__((const))
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