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 LL_DEP_MAP_INIT(lockname)			\
18 	.dep_map = {					\
19 		.name = #lockname,			\
20 		.wait_type_inner = LD_WAIT_CONFIG,	\
21 	}
22 #else
23 # define LL_DEP_MAP_INIT(lockname)
24 #endif
25 
26 #define INIT_LOCAL_LOCK(lockname)	{ LL_DEP_MAP_INIT(lockname) }
27 
28 #define __local_lock_init(lock)					\
29 do {								\
30 	static struct lock_class_key __key;			\
31 								\
32 	debug_check_no_locks_freed((void *)lock, sizeof(*lock));\
33 	lockdep_init_map_wait(&(lock)->dep_map, #lock, &__key, 0, LD_WAIT_CONFIG);\
34 } while (0)
35 
36 #ifdef CONFIG_DEBUG_LOCK_ALLOC
37 static inline void local_lock_acquire(local_lock_t *l)
38 {
39 	lock_map_acquire(&l->dep_map);
40 	DEBUG_LOCKS_WARN_ON(l->owner);
41 	l->owner = current;
42 }
43 
44 static inline void local_lock_release(local_lock_t *l)
45 {
46 	DEBUG_LOCKS_WARN_ON(l->owner != current);
47 	l->owner = NULL;
48 	lock_map_release(&l->dep_map);
49 }
50 
51 #else /* CONFIG_DEBUG_LOCK_ALLOC */
52 static inline void local_lock_acquire(local_lock_t *l) { }
53 static inline void local_lock_release(local_lock_t *l) { }
54 #endif /* !CONFIG_DEBUG_LOCK_ALLOC */
55 
56 #define __local_lock(lock)					\
57 	do {							\
58 		preempt_disable();				\
59 		local_lock_acquire(this_cpu_ptr(lock));		\
60 	} while (0)
61 
62 #define __local_lock_irq(lock)					\
63 	do {							\
64 		local_irq_disable();				\
65 		local_lock_acquire(this_cpu_ptr(lock));		\
66 	} while (0)
67 
68 #define __local_lock_irqsave(lock, flags)			\
69 	do {							\
70 		local_irq_save(flags);				\
71 		local_lock_acquire(this_cpu_ptr(lock));		\
72 	} while (0)
73 
74 #define __local_unlock(lock)					\
75 	do {							\
76 		local_lock_release(this_cpu_ptr(lock));		\
77 		preempt_enable();				\
78 	} while (0)
79 
80 #define __local_unlock_irq(lock)				\
81 	do {							\
82 		local_lock_release(this_cpu_ptr(lock));		\
83 		local_irq_enable();				\
84 	} while (0)
85 
86 #define __local_unlock_irqrestore(lock, flags)			\
87 	do {							\
88 		local_lock_release(this_cpu_ptr(lock));		\
89 		local_irq_restore(flags);			\
90 	} while (0)
91