Linux Kernel  3.7.1
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builtin-__fls.h
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1 #ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
2 #define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
3 
10 static __always_inline unsigned long __fls(unsigned long word)
11 {
12  return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
13 }
14 
15 #endif
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