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_DEBUG_SPINLOCK
  23         unsigned int magic, owner_cpu;
  24         void *owner;
  25 #endif
  26 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  27         struct lockdep_map dep_map;
  28 #endif
  29 } raw_spinlock_t;
  30
  31 #define SPINLOCK_MAGIC          0xdead4ead
  32
  33 #define SPINLOCK_OWNER_INIT     ((void *)-1L)
  34
  35 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  36 # define SPIN_DEP_MAP_INIT(lockname)    .dep_map = { .name = #lockname }
  37 #else
  38 # define SPIN_DEP_MAP_INIT(lockname)
  39 #endif
  40
  41 #ifdef CONFIG_DEBUG_SPINLOCK
  42 # define SPIN_DEBUG_INIT(lockname)              \
  43         .magic = SPINLOCK_MAGIC,                \
  44         .owner_cpu = -1,                        \
  45         .owner = SPINLOCK_OWNER_INIT,
  46 #else
  47 # define SPIN_DEBUG_INIT(lockname)
  48 #endif
  49
  50 #define __RAW_SPIN_LOCK_INITIALIZER(lockname)   \
  51         {                                       \
  52         .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  53         SPIN_DEBUG_INIT(lockname)               \
  54         SPIN_DEP_MAP_INIT(lockname) }
  55
  56 #define __RAW_SPIN_LOCK_UNLOCKED(lockname)      \
  57         (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
  58
  59 #define DEFINE_RAW_SPINLOCK(x)  raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
  60
  61 typedef struct spinlock {
  62         union {
  63                 struct raw_spinlock rlock;
  64
  65 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  66 # define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
  67                 struct {
  68                         u8 __padding[LOCK_PADSIZE];
  69                         struct lockdep_map dep_map;
  70                 };
  71 #endif
  72         };
  73 } spinlock_t;
  74
  75 #define __SPIN_LOCK_INITIALIZER(lockname) \
  76         { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
  77
  78 #define __SPIN_LOCK_UNLOCKED(lockname) \
  79         (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
  80
  81 #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  82
  83 #include <linux/rwlock_types.h>
  84
  85 #endif /* __LINUX_SPINLOCK_TYPES_H */