Cregit: Linux 6.12: _

Contributors: 5
Author	Tokens	Token Proportion	Commits	Commit Proportion
Akinobu Mita	150	89.29%	1	16.67%
Xiao Wang	14	8.33%	2	33.33%
Thorsten Blum	2	1.19%	1	16.67%
Greg Kroah-Hartman	1	0.60%	1	16.67%
Andi Kleen	1	0.60%	1	16.67%
Total	168		6

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_BITOPS___FFS_H_
#define _ASM_GENERIC_BITOPS___FFS_H_

#include <asm/types.h>

/**
 * generic___ffs - find first bit in word.
 * @word: The word to search
 *
 * Undefined if no bit exists, so code should check against 0 first.
 */
static __always_inline unsigned int generic___ffs(unsigned long word)
{
	unsigned int num = 0;

#if BITS_PER_LONG == 64
	if ((word & 0xffffffff) == 0) {
		num += 32;
		word >>= 32;
	}
#endif
	if ((word & 0xffff) == 0) {
		num += 16;
		word >>= 16;
	}
	if ((word & 0xff) == 0) {
		num += 8;
		word >>= 8;
	}
	if ((word & 0xf) == 0) {
		num += 4;
		word >>= 4;
	}
	if ((word & 0x3) == 0) {
		num += 2;
		word >>= 2;
	}
	if ((word & 0x1) == 0)
		num += 1;
	return num;
}

#ifndef __HAVE_ARCH___FFS
#define __ffs(word) generic___ffs(word)
#endif

#endif /* _ASM_GENERIC_BITOPS___FFS_H_ */

__ffs.h