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https://github.com/torvalds/linux
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Tip revision: 04974df8049fc4240d22759a91e035082ccd18b4 authored by Linus Torvalds on 01 May 2016, 22:52:31 UTC
Linux 4.6-rc6
Tip revision: 04974df
builtin-__fls.h
#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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