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