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 raw_spinlock {
  21         arch_spinlock_t raw_lock;
  22 #ifdef CONFIG_GENERIC_LOCKBREAK
  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 } raw_spinlock_t;
  33
  34 #define SPINLOCK_MAGIC          0xdead4ead
  35
  36 #define SPINLOCK_OWNER_INIT     ((void *)-1L)
  37
  38 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  39 # define SPIN_DEP_MAP_INIT(lockname)    .dep_map = { .name = #lockname }
  40 #else
  41 # define SPIN_DEP_MAP_INIT(lockname)
  42 #endif
  43
  44 #ifdef CONFIG_DEBUG_SPINLOCK
  45 # define SPIN_DEBUG_INIT(lockname)              \
  46         .magic = SPINLOCK_MAGIC,                \
  47         .owner_cpu = -1,                        \
  48         .owner = SPINLOCK_OWNER_INIT,
  49 #else
  50 # define SPIN_DEBUG_INIT(lockname)
  51 #endif
  52
  53 #define __RAW_SPIN_LOCK_INITIALIZER(lockname)   \
  54         {                                       \
  55         .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  56         SPIN_DEBUG_INIT(lockname)               \
  57         SPIN_DEP_MAP_INIT(lockname) }
  58
  59 #define __RAW_SPIN_LOCK_UNLOCKED(lockname)      \
  60         (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
  61
  62 #define DEFINE_RAW_SPINLOCK(x)  raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
  63
  64 typedef struct spinlock {
  65         union {
  66                 struct raw_spinlock rlock;
  67
  68 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  69 # define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
  70                 struct {
  71                         u8 __padding[LOCK_PADSIZE];
  72                         struct lockdep_map dep_map;
  73                 };
  74 #endif
  75         };
  76 } spinlock_t;
  77
  78 #define __SPIN_LOCK_INITIALIZER(lockname) \
  79         { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
  80
  81 #define __SPIN_LOCK_UNLOCKED(lockname) \
  82         (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
  83
  84 /*
  85  * SPIN_LOCK_UNLOCKED defeats lockdep state tracking and is hence
  86  * deprecated.
  87  * Please use DEFINE_SPINLOCK() or __SPIN_LOCK_UNLOCKED() as
  88  * appropriate.
  89  */
  90 #define SPIN_LOCK_UNLOCKED      __SPIN_LOCK_UNLOCKED(old_style_spin_init)
  91
  92 #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  93
  94 #include <linux/rwlock_types.h>
  95
  96 #endif /* __LINUX_SPINLOCK_TYPES_H */