include/linux/spinlock_types.h

   1 #ifndef __LINUX_SPINLOCK_TYPES_H
   2 #define __LINUX_SPINLOCK_TYPES_H
   3
   4 /*
   5  * include/linux/spinlock_types.h - generic spinlock type definitions
   6  *                                  and initializers
   7  *
   8  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
   9  * Released under the General Public License (GPL).
  10  */
  11
  12 #if defined(CONFIG_SMP)
  13 # include <asm/spinlock_types.h>
  14 #else
  15 # include <linux/spinlock_types_up.h>
  16 #endif
  17
  18 #include <linux/lockdep.h>
  19
  20 typedef struct {
  21         raw_spinlock_t raw_lock;
  22 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
  23         unsigned int break_lock;
  24 #endif
  25 #ifdef CONFIG_DEBUG_SPINLOCK
  26         unsigned int magic, owner_cpu;
  27         void *owner;
  28 #endif
  29 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  30         struct lockdep_map dep_map;
  31 #endif
  32 } spinlock_t;
  33
  34 #define SPINLOCK_MAGIC          0xdead4ead
  35
  36 typedef struct {
  37         raw_rwlock_t raw_lock;
  38 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
  39         unsigned int break_lock;
  40 #endif
  41 #ifdef CONFIG_DEBUG_SPINLOCK
  42         unsigned int magic, owner_cpu;
  43         void *owner;
  44 #endif
  45 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  46         struct lockdep_map dep_map;
  47 #endif
  48 } rwlock_t;
  49
  50 #define RWLOCK_MAGIC            0xdeaf1eed
  51
  52 #define SPINLOCK_OWNER_INIT     ((void *)-1L)
  53
  54 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  55 # define SPIN_DEP_MAP_INIT(lockname)    .dep_map = { .name = #lockname }
  56 #else
  57 # define SPIN_DEP_MAP_INIT(lockname)
  58 #endif
  59
  60 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  61 # define RW_DEP_MAP_INIT(lockname)      .dep_map = { .name = #lockname }
  62 #else
  63 # define RW_DEP_MAP_INIT(lockname)
  64 #endif
  65
  66 #ifdef CONFIG_DEBUG_SPINLOCK
  67 # define __SPIN_LOCK_UNLOCKED(lockname)                                 \
  68         (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED,   \
  69                                 .magic = SPINLOCK_MAGIC,                \
  70                                 .owner = SPINLOCK_OWNER_INIT,           \
  71                                 .owner_cpu = -1,                        \
  72                                 SPIN_DEP_MAP_INIT(lockname) }
  73 #define __RW_LOCK_UNLOCKED(lockname)                                    \
  74         (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
  75                                 .magic = RWLOCK_MAGIC,                  \
  76                                 .owner = SPINLOCK_OWNER_INIT,           \
  77                                 .owner_cpu = -1,                        \
  78                                 RW_DEP_MAP_INIT(lockname) }
  79 #else
  80 # define __SPIN_LOCK_UNLOCKED(lockname) \
  81         (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED,   \
  82                                 SPIN_DEP_MAP_INIT(lockname) }
  83 #define __RW_LOCK_UNLOCKED(lockname) \
  84         (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
  85                                 RW_DEP_MAP_INIT(lockname) }
  86 #endif
  87
  88 /*
  89  * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
  90  * are hence deprecated.
  91  * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
  92  * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate.
  93  */
  94 #define SPIN_LOCK_UNLOCKED      __SPIN_LOCK_UNLOCKED(old_style_spin_init)
  95 #define RW_LOCK_UNLOCKED        __RW_LOCK_UNLOCKED(old_style_rw_init)
  96
  97 #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  98 #define DEFINE_RWLOCK(x)        rwlock_t x = __RW_LOCK_UNLOCKED(x)
  99
 100 #endif /* __LINUX_SPINLOCK_TYPES_H */