include/linux/local_lock_internal.h

   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)