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[POWERPC] Add "is_power_of_2" checking to log2.h.

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Add the inline function "is_power_of_2()" to log2.h, where the value
zero is *not* considered to be a power of two.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Robert P. J. Day 2007-01-30 06:06:00 -05:00 • committed by Paul Mackerras
parent 7df2457db8
commit 63c2f782e8
5 changed files with 13 additions and 12 deletions
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11
include/linux/log2.h
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@ -43,6 +43,17 @@ int __ilog2_u64(u64 n)
}
#endif
/*
* Determine whether some value is a power of two, where zero is
* *not* considered a power of two.
*/
static inline __attribute__((const))
bool is_power_of_2(unsigned long n)
{
return (n != 0 && ((n & (n - 1)) == 0));
}
/*
* round up to nearest power of two
*/