diff options
Diffstat (limited to 'include/linux/log2.h')
| -rw-r--r-- | include/linux/log2.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index d02e1a547a7e..57e641e19a81 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -44,6 +44,17 @@ 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 */ static inline __attribute__((const)) @@ -141,7 +152,7 @@ unsigned long __roundup_pow_of_two(unsigned long n) * roundup_pow_of_two - round the given value up to nearest power of two * @n - parameter * - * round the given balue up to the nearest power of two + * round the given value up to the nearest power of two * - the result is undefined when n == 0 * - this can be used to initialise global variables from constant data */ |