Warning: That file was not part of the compilation database. It may have many parsing errors.

1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_BITOPS___FFS_H_
3#define _ASM_GENERIC_BITOPS___FFS_H_
4
5#include <asm/types.h>
6
7/**
8 * __ffs - find first bit in word.
9 * @word: The word to search
10 *
11 * Undefined if no bit exists, so code should check against 0 first.
12 */
13static __always_inline unsigned long __ffs(unsigned long word)
14{
15 int num = 0;
16
17#if BITS_PER_LONG == 64
18 if ((word & 0xffffffff) == 0) {
19 num += 32;
20 word >>= 32;
21 }
22#endif
23 if ((word & 0xffff) == 0) {
24 num += 16;
25 word >>= 16;
26 }
27 if ((word & 0xff) == 0) {
28 num += 8;
29 word >>= 8;
30 }
31 if ((word & 0xf) == 0) {
32 num += 4;
33 word >>= 4;
34 }
35 if ((word & 0x3) == 0) {
36 num += 2;
37 word >>= 2;
38 }
39 if ((word & 0x1) == 0)
40 num += 1;
41 return num;
42}
43
44#endif /* _ASM_GENERIC_BITOPS___FFS_H_ */
45

Warning: That file was not part of the compilation database. It may have many parsing errors.

source code of linux/include/asm-generic/bitops/__ffs.h