1#ifndef _ASM_GENERIC_BITOPS_FFS_H_
2#define _ASM_GENERIC_BITOPS_FFS_H_
3
4/**
5 * ffs - find first bit set
6 * @x: the word to search
7 *
8 * This is defined the same way as
9 * the libc and compiler builtin ffs routines, therefore
10 * differs in spirit from the above ffz (man ffs).
11 */
12static inline int ffs(int x)
13{
14	int r = 1;
15
16	if (!x)
17		return 0;
18	if (!(x & 0xffff)) {
19		x >>= 16;
20		r += 16;
21	}
22	if (!(x & 0xff)) {
23		x >>= 8;
24		r += 8;
25	}
26	if (!(x & 0xf)) {
27		x >>= 4;
28		r += 4;
29	}
30	if (!(x & 3)) {
31		x >>= 2;
32		r += 2;
33	}
34	if (!(x & 1)) {
35		x >>= 1;
36		r += 1;
37	}
38	return r;
39}
40
41#endif /* _ASM_GENERIC_BITOPS_FFS_H_ */
42