diff options
Diffstat (limited to 'include/linux/log2.h')
| -rw-r--r-- | include/linux/log2.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index c619ec6eff4a..1366cb688a6d 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -18,7 +18,7 @@ * - the arch is not required to handle n==0 if implementing the fallback */ #ifndef CONFIG_ARCH_HAS_ILOG2_U32 -static inline __attribute__((const)) +static __always_inline __attribute__((const)) int __ilog2_u32(u32 n) { return fls(n) - 1; @@ -26,7 +26,7 @@ int __ilog2_u32(u32 n) #endif #ifndef CONFIG_ARCH_HAS_ILOG2_U64 -static inline __attribute__((const)) +static __always_inline __attribute__((const)) int __ilog2_u64(u64 n) { return fls64(n) - 1; @@ -41,7 +41,7 @@ int __ilog2_u64(u64 n) * *not* considered a power of two. * Return: true if @n is a power of 2, otherwise false. */ -static inline __attribute__((const)) +static __always_inline __attribute__((const)) bool is_power_of_2(unsigned long n) { return (n != 0 && ((n & (n - 1)) == 0)); @@ -156,7 +156,8 @@ unsigned long __rounddown_pow_of_two(unsigned long n) #define ilog2(n) \ ( \ __builtin_constant_p(n) ? \ - const_ilog2(n) : \ + ((n) < 2 ? 0 : \ + 63 - __builtin_clzll(n)) : \ (sizeof(n) <= 4) ? \ __ilog2_u32(n) : \ __ilog2_u64(n) \ |