root/include/asm-generic/bitops/builtin-__fls.h

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DEFINITIONS

This source file includes following definitions.
  1. __fls
#ifndef _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_
#define _ASM_GENERIC_BITOPS_BUILTIN___FLS_H_

/**
 * __fls - find last (most-significant) set bit in a long word
 * @word: the word to search
 *
 * Undefined if no set bit exists, so code should check against 0 first.
 */
static __always_inline unsigned long __fls(unsigned long word)
{
        return (sizeof(word) * 8) - 1 - __builtin_clzl(word);
}

#endif
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