1/* SPDX-License-Identifier: GPL-2.0 */
 2
 3#ifndef BTRFS_MISC_H
 4#define BTRFS_MISC_H
 5
 6#include <linux/sched.h>
 7#include <linux/wait.h>
 8#include <asm/div64.h>
 9
10#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
11
12static inline void cond_wake_up(struct wait_queue_head *wq)
13{
14	/*
15	 * This implies a full smp_mb barrier, see comments for
16	 * waitqueue_active why.
17	 */
18	if (wq_has_sleeper(wq))
19		wake_up(wq);
20}
21
22static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
23{
24	/*
25	 * Special case for conditional wakeup where the barrier required for
26	 * waitqueue_active is implied by some of the preceding code. Eg. one
27	 * of such atomic operations (atomic_dec_and_return, ...), or a
28	 * unlock/lock sequence, etc.
29	 */
30	if (waitqueue_active(wq))
31		wake_up(wq);
32}
33
34static inline u64 div_factor(u64 num, int factor)
35{
36	if (factor == 10)
37		return num;
38	num *= factor;
39	return div_u64(num, 10);
40}
41
42static inline u64 div_factor_fine(u64 num, int factor)
43{
44	if (factor == 100)
45		return num;
46	num *= factor;
47	return div_u64(num, 100);
48}
49
50#endif