* the clz instruction for much better code efficiency.
*/
-static __inline__ int generic_fls(int x);
+extern __inline__ int generic_fls(int x);
#define fls(x) \
( __builtin_constant_p(x) ? generic_fls(x) : \
({ int __r; asm("clz\t%0, %1" : "=r"(__r) : "r"(x) : "cc"); 32-__r; }) )