projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 602cbe91 DS |
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> | |
| 784352fe | 8 | #include <asm/div64.h> |
| 602cbe91 DS |
9 | |
| 10 | #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) | |
| 11 | ||
| 12 | static 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 | ||
| 22 | static 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 | ||
| 784352fe DS |
34 | static 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 | ||
| 42 | static 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 | ||
| 79c8264e DS |
50 | /* Copy of is_power_of_two that is 64bit safe */ |
| 51 | static inline bool is_power_of_two_u64(u64 n) | |
| 52 | { | |
| 53 | return n != 0 && (n & (n - 1)) == 0; | |
| 54 | } | |
| 55 | ||
| 56 | static inline bool has_single_bit_set(u64 n) | |
| 57 | { | |
| 58 | return is_power_of_two_u64(n); | |
| 59 | } | |
| 60 | ||
| 602cbe91 | 61 | #endif |