diff options
Diffstat (limited to 'include/linux/log2.h')
| -rw-r--r-- | include/linux/log2.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/log2.h b/include/linux/log2.h index c619ec6eff4a..df0b155c2141 100644 --- a/include/linux/log2.h +++ b/include/linux/log2.h @@ -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) \ |