Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_LOCAL_LOCK_H |
| 3 | # error "Do not include directly, include linux/local_lock.h" |
| 4 | #endif |
| 5 | |
| 6 | #include <linux/percpu-defs.h> |
| 7 | #include <linux/lockdep.h> |
| 8 | |
| 9 | typedef struct { |
| 10 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 11 | struct lockdep_map dep_map; |
| 12 | struct task_struct *owner; |
| 13 | #endif |
| 14 | } local_lock_t; |
| 15 | |
| 16 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 17 | # define LOCAL_LOCK_DEBUG_INIT(lockname) \ |
| 18 | .dep_map = { \ |
| 19 | .name = #lockname, \ |
| 20 | .wait_type_inner = LD_WAIT_CONFIG, \ |
| 21 | .lock_type = LD_LOCK_PERCPU, \ |
| 22 | }, \ |
| 23 | .owner = NULL, |
| 24 | |
| 25 | static inline void local_lock_acquire(local_lock_t *l) |
| 26 | { |
| 27 | lock_map_acquire(&l->dep_map); |
| 28 | DEBUG_LOCKS_WARN_ON(l->owner); |
| 29 | l->owner = current; |
| 30 | } |
| 31 | |
| 32 | static inline void local_lock_release(local_lock_t *l) |
| 33 | { |
| 34 | DEBUG_LOCKS_WARN_ON(l->owner != current); |
| 35 | l->owner = NULL; |
| 36 | lock_map_release(&l->dep_map); |
| 37 | } |
| 38 | |
| 39 | static inline void local_lock_debug_init(local_lock_t *l) |
| 40 | { |
| 41 | l->owner = NULL; |
| 42 | } |
| 43 | #else /* CONFIG_DEBUG_LOCK_ALLOC */ |
| 44 | # define LOCAL_LOCK_DEBUG_INIT(lockname) |
| 45 | static inline void local_lock_acquire(local_lock_t *l) { } |
| 46 | static inline void local_lock_release(local_lock_t *l) { } |
| 47 | static inline void local_lock_debug_init(local_lock_t *l) { } |
| 48 | #endif /* !CONFIG_DEBUG_LOCK_ALLOC */ |
| 49 | |
| 50 | #define INIT_LOCAL_LOCK(lockname) { LOCAL_LOCK_DEBUG_INIT(lockname) } |
| 51 | |
| 52 | #define __local_lock_init(lock) \ |
| 53 | do { \ |
| 54 | static struct lock_class_key __key; \ |
| 55 | \ |
| 56 | debug_check_no_locks_freed((void *)lock, sizeof(*lock));\ |
| 57 | lockdep_init_map_type(&(lock)->dep_map, #lock, &__key, \ |
| 58 | 0, LD_WAIT_CONFIG, LD_WAIT_INV, \ |
| 59 | LD_LOCK_PERCPU); \ |
| 60 | local_lock_debug_init(lock); \ |
| 61 | } while (0) |
| 62 | |
| 63 | #define __local_lock(lock) \ |
| 64 | do { \ |
| 65 | preempt_disable(); \ |
| 66 | local_lock_acquire(this_cpu_ptr(lock)); \ |
| 67 | } while (0) |
| 68 | |
| 69 | #define __local_lock_irq(lock) \ |
| 70 | do { \ |
| 71 | local_irq_disable(); \ |
| 72 | local_lock_acquire(this_cpu_ptr(lock)); \ |
| 73 | } while (0) |
| 74 | |
| 75 | #define __local_lock_irqsave(lock, flags) \ |
| 76 | do { \ |
| 77 | local_irq_save(flags); \ |
| 78 | local_lock_acquire(this_cpu_ptr(lock)); \ |
| 79 | } while (0) |
| 80 | |
| 81 | #define __local_unlock(lock) \ |
| 82 | do { \ |
| 83 | local_lock_release(this_cpu_ptr(lock)); \ |
| 84 | preempt_enable(); \ |
| 85 | } while (0) |
| 86 | |
| 87 | #define __local_unlock_irq(lock) \ |
| 88 | do { \ |
| 89 | local_lock_release(this_cpu_ptr(lock)); \ |
| 90 | local_irq_enable(); \ |
| 91 | } while (0) |
| 92 | |
| 93 | #define __local_unlock_irqrestore(lock, flags) \ |
| 94 | do { \ |
| 95 | local_lock_release(this_cpu_ptr(lock)); \ |
| 96 | local_irq_restore(flags); \ |
| 97 | } while (0) |