diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/log2.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index d02e1a547a7e..99922bedfcc9 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)) |