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https://github.com/torvalds/linux
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Tip revision: 1291a0d5049dbc06baaaf66a9ff3f53db493b19b authored by Linus Torvalds on 18 December 2017, 02:59:59 UTC
Linux 4.15-rc4
Tip revision: 1291a0d
builtin-__fls.h
/* SPDX-License-Identifier: GPL-2.0 */
#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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