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 RAW_SPIN_DEP_MAP_INIT(lockname)                \
  37         .dep_map = {                                    \
  38                 .name = #lockname,                      \
  39                 .wait_type_inner = LD_WAIT_SPIN,        \
  40         }
  41 # define SPIN_DEP_MAP_INIT(lockname)                    \
  42         .dep_map = {                                    \
  43                 .name = #lockname,                      \
  44                 .wait_type_inner = LD_WAIT_CONFIG,      \
  45         }
  46 #else
  47 # define RAW_SPIN_DEP_MAP_INIT(lockname)
  48 # define SPIN_DEP_MAP_INIT(lockname)
  49 #endif
  50
  51 #ifdef CONFIG_DEBUG_SPINLOCK
  52 # define SPIN_DEBUG_INIT(lockname)              \
  53         .magic = SPINLOCK_MAGIC,                \
  54         .owner_cpu = -1,                        \
  55         .owner = SPINLOCK_OWNER_INIT,
  56 #else
  57 # define SPIN_DEBUG_INIT(lockname)
  58 #endif
  59
  60 #define __RAW_SPIN_LOCK_INITIALIZER(lockname)   \
  61         {                                       \
  62         .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  63         SPIN_DEBUG_INIT(lockname)               \
  64         RAW_SPIN_DEP_MAP_INIT(lockname) }
  65
  66 #define __RAW_SPIN_LOCK_UNLOCKED(lockname)      \
  67         (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
  68
  69 #define DEFINE_RAW_SPINLOCK(x)  raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
  70
  71 typedef struct spinlock {
  72         union {
  73                 struct raw_spinlock rlock;
  74
  75 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  76 # define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
  77                 struct {
  78                         u8 __padding[LOCK_PADSIZE];
  79                         struct lockdep_map dep_map;
  80                 };
  81 #endif
  82         };
  83 } spinlock_t;
  84
  85 #define ___SPIN_LOCK_INITIALIZER(lockname)      \
  86         {                                       \
  87         .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  88         SPIN_DEBUG_INIT(lockname)               \
  89         SPIN_DEP_MAP_INIT(lockname) }
  90
  91 #define __SPIN_LOCK_INITIALIZER(lockname) \
  92         { { .rlock = ___SPIN_LOCK_INITIALIZER(lockname) } }
  93
  94 #define __SPIN_LOCK_UNLOCKED(lockname) \
  95         (spinlock_t) __SPIN_LOCK_INITIALIZER(lockname)
  96
  97 #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  98
  99 #include <linux/rwlock_types.h>
 100
 101 #endif /* __LINUX_SPINLOCK_TYPES_H */