1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_GENERIC_BITOPS_FLS64_H_
 3#define _ASM_GENERIC_BITOPS_FLS64_H_
 4
 5#include <asm/types.h>
 6
 7/**
 8 * fls64 - find last set bit in a 64-bit word
 9 * @x: the word to search
10 *
11 * This is defined in a similar way as the libc and compiler builtin
12 * ffsll, but returns the position of the most significant set bit.
13 *
14 * fls64(value) returns 0 if value is 0 or the position of the last
15 * set bit if value is nonzero. The last (most significant) bit is
16 * at position 64.
17 */
18#if BITS_PER_LONG == 32
19static __always_inline int fls64(__u64 x)
20{
21	__u32 h = x >> 32;
22	if (h)
23		return fls(h) + 32;
24	return fls(x);
25}
26#elif BITS_PER_LONG == 64
27static __always_inline int fls64(__u64 x)
28{
29	if (x == 0)
30		return 0;
31	return __fls(x) + 1;
32}
33#else
34#error BITS_PER_LONG not 32 or 64
35#endif
36
37#endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */

 
 1#ifndef _ASM_GENERIC_BITOPS_FLS64_H_
 2#define _ASM_GENERIC_BITOPS_FLS64_H_
 3
 4#include <asm/types.h>
 5
 6/**
 7 * fls64 - find last set bit in a 64-bit word
 8 * @x: the word to search
 9 *
10 * This is defined in a similar way as the libc and compiler builtin
11 * ffsll, but returns the position of the most significant set bit.
12 *
13 * fls64(value) returns 0 if value is 0 or the position of the last
14 * set bit if value is nonzero. The last (most significant) bit is
15 * at position 64.
16 */
17#if BITS_PER_LONG == 32
18static __always_inline int fls64(__u64 x)
19{
20	__u32 h = x >> 32;
21	if (h)
22		return fls(h) + 32;
23	return fls(x);
24}
25#elif BITS_PER_LONG == 64
26static __always_inline int fls64(__u64 x)
27{
28	if (x == 0)
29		return 0;
30	return __fls(x) + 1;
31}
32#else
33#error BITS_PER_LONG not 32 or 64
34#endif
35
36#endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */