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authorThomas Gleixner <tglx@linutronix.de>2009-12-02 20:02:59 +0100
committerThomas Gleixner <tglx@linutronix.de>2009-12-14 23:55:32 +0100
commitc2f21ce2e31286a0a32f8da0a7856e9ca1122ef3 (patch)
tree6cc8d1fd37ffa6d02481353857b92734241f4dd0 /include/linux
parente5931943d02bf751b1ec849c0d2ade23d76a8d41 (diff)
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locking: Implement new raw_spinlock
Now that the raw_spin name space is freed up, we can implement raw_spinlock and the related functions which are used to annotate the locks which are not converted to sleeping spinlocks in preempt-rt. A side effect is that only such locks can be used with the low level lock fsunctions which circumvent lockdep. For !rt spin_* functions are mapped to the raw_spin* implementations. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/spinlock.h258
-rw-r--r--include/linux/spinlock_api_smp.h51
-rw-r--r--include/linux/spinlock_api_up.h2
-rw-r--r--include/linux/spinlock_types.h49
4 files changed, 260 insertions, 100 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 53bc2213b41..ef5a55d96b9 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -80,7 +80,7 @@
#include <linux/spinlock_types.h>
/*
- * Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
+ * Pull the arch_spin*() functions/declarations (UP-nondebug doesnt need them):
*/
#ifdef CONFIG_SMP
# include <asm/spinlock.h>
@@ -89,30 +89,30 @@
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
- extern void __spin_lock_init(spinlock_t *lock, const char *name,
- struct lock_class_key *key);
-# define spin_lock_init(lock) \
+ extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
+ struct lock_class_key *key);
+# define raw_spin_lock_init(lock) \
do { \
static struct lock_class_key __key; \
\
- __spin_lock_init((lock), #lock, &__key); \
+ __raw_spin_lock_init((lock), #lock, &__key); \
} while (0)
#else
-# define spin_lock_init(lock) \
- do { *(lock) = __SPIN_LOCK_UNLOCKED(lock); } while (0)
+# define raw_spin_lock_init(lock) \
+ do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0)
#endif
-#define spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock)
+#define raw_spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock)
#ifdef CONFIG_GENERIC_LOCKBREAK
-#define spin_is_contended(lock) ((lock)->break_lock)
+#define raw_spin_is_contended(lock) ((lock)->break_lock)
#else
#ifdef arch_spin_is_contended
-#define spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock)
+#define raw_spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock)
#else
-#define spin_is_contended(lock) (((void)(lock), 0))
+#define raw_spin_is_contended(lock) (((void)(lock), 0))
#endif /*arch_spin_is_contended*/
#endif
@@ -122,22 +122,37 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#endif
/**
- * spin_unlock_wait - wait until the spinlock gets unlocked
+ * raw_spin_unlock_wait - wait until the spinlock gets unlocked
* @lock: the spinlock in question.
*/
-#define spin_unlock_wait(lock) arch_spin_unlock_wait(&(lock)->raw_lock)
+#define raw_spin_unlock_wait(lock) arch_spin_unlock_wait(&(lock)->raw_lock)
#ifdef CONFIG_DEBUG_SPINLOCK
- extern void _raw_spin_lock(spinlock_t *lock);
+ extern void _raw_spin_lock(raw_spinlock_t *lock);
#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
- extern int _raw_spin_trylock(spinlock_t *lock);
- extern void _raw_spin_unlock(spinlock_t *lock);
+ extern int _raw_spin_trylock(raw_spinlock_t *lock);
+ extern void _raw_spin_unlock(raw_spinlock_t *lock);
#else
-# define _raw_spin_lock(lock) arch_spin_lock(&(lock)->raw_lock)
-# define _raw_spin_lock_flags(lock, flags) \
- arch_spin_lock_flags(&(lock)->raw_lock, *(flags))
-# define _raw_spin_trylock(lock) arch_spin_trylock(&(lock)->raw_lock)
-# define _raw_spin_unlock(lock) arch_spin_unlock(&(lock)->raw_lock)
+static inline void _raw_spin_lock(raw_spinlock_t *lock)
+{
+ arch_spin_lock(&lock->raw_lock);
+}
+
+static inline void
+_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags)
+{
+ arch_spin_lock_flags(&lock->raw_lock, *flags);
+}
+
+static inline int _raw_spin_trylock(raw_spinlock_t *lock)
+{
+ return arch_spin_trylock(&(lock)->raw_lock);
+}
+
+static inline void _raw_spin_unlock(raw_spinlock_t *lock)
+{
+ arch_spin_unlock(&lock->raw_lock);
+}
#endif
/*
@@ -146,38 +161,38 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
* various methods are defined as nops in the case they are not
* required.
*/
-#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
+#define raw_spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
-#define spin_lock(lock) _spin_lock(lock)
+#define raw_spin_lock(lock) _spin_lock(lock)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
-# define spin_lock_nest_lock(lock, nest_lock) \
+# define raw_spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
+# define raw_spin_lock_nest_lock(lock, nest_lock) \
do { \
typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
} while (0)
#else
-# define spin_lock_nested(lock, subclass) _spin_lock(lock)
-# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
+# define raw_spin_lock_nested(lock, subclass) _spin_lock(lock)
+# define raw_spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
#endif
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
-#define spin_lock_irqsave(lock, flags) \
+#define raw_spin_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = _spin_lock_irqsave(lock); \
} while (0)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
-#define spin_lock_irqsave_nested(lock, flags, subclass) \
+#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
do { \
typecheck(unsigned long, flags); \
flags = _spin_lock_irqsave_nested(lock, subclass); \
} while (0)
#else
-#define spin_lock_irqsave_nested(lock, flags, subclass) \
+#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
do { \
typecheck(unsigned long, flags); \
flags = _spin_lock_irqsave(lock); \
@@ -186,45 +201,178 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
#else
-#define spin_lock_irqsave(lock, flags) \
+#define raw_spin_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
_spin_lock_irqsave(lock, flags); \
} while (0)
-#define spin_lock_irqsave_nested(lock, flags, subclass) \
- spin_lock_irqsave(lock, flags)
+#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
+ raw_spin_lock_irqsave(lock, flags)
#endif
-#define spin_lock_irq(lock) _spin_lock_irq(lock)
-#define spin_lock_bh(lock) _spin_lock_bh(lock)
-#define spin_unlock(lock) _spin_unlock(lock)
-#define spin_unlock_irq(lock) _spin_unlock_irq(lock)
+#define raw_spin_lock_irq(lock) _spin_lock_irq(lock)
+#define raw_spin_lock_bh(lock) _spin_lock_bh(lock)
+#define raw_spin_unlock(lock) _spin_unlock(lock)
+#define raw_spin_unlock_irq(lock) _spin_unlock_irq(lock)
-#define spin_unlock_irqrestore(lock, flags) \
- do { \
- typecheck(unsigned long, flags); \
+#define raw_spin_unlock_irqrestore(lock, flags) \
+ do { \
+ typecheck(unsigned long, flags); \
_spin_unlock_irqrestore(lock, flags); \
} while (0)
-#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
+#define raw_spin_unlock_bh(lock) _spin_unlock_bh(lock)
-#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
+#define raw_spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
-#define spin_trylock_irq(lock) \
+#define raw_spin_trylock_irq(lock) \
({ \
local_irq_disable(); \
- spin_trylock(lock) ? \
+ raw_spin_trylock(lock) ? \
1 : ({ local_irq_enable(); 0; }); \
})
-#define spin_trylock_irqsave(lock, flags) \
+#define raw_spin_trylock_irqsave(lock, flags) \
({ \
local_irq_save(flags); \
- spin_trylock(lock) ? \
+ raw_spin_trylock(lock) ? \
1 : ({ local_irq_restore(flags); 0; }); \
})
+/**
+ * raw_spin_can_lock - would raw_spin_trylock() succeed?
+ * @lock: the spinlock in question.
+ */
+#define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
+
+/* Include rwlock functions */
+#include <linux/rwlock.h>
+
+/*
+ * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
+ */
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+# include <linux/spinlock_api_smp.h>
+#else
+# include <linux/spinlock_api_up.h>
+#endif
+
+/*
+ * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
+ */
+
+static inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
+{
+ return &lock->rlock;
+}
+
+#define spin_lock_init(_lock) \
+do { \
+ spinlock_check(_lock); \
+ raw_spin_lock_init(&(_lock)->rlock); \
+} while (0)
+
+static inline void spin_lock(spinlock_t *lock)
+{
+ raw_spin_lock(&lock->rlock);
+}
+
+static inline void spin_lock_bh(spinlock_t *lock)
+{
+ raw_spin_lock_bh(&lock->rlock);
+}
+
+static inline int spin_trylock(spinlock_t *lock)
+{
+ return raw_spin_trylock(&lock->rlock);
+}
+
+#define spin_lock_nested(lock, subclass) \
+do { \
+ raw_spin_lock_nested(spinlock_check(lock), subclass); \
+} while (0)
+
+#define spin_lock_nest_lock(lock, nest_lock) \
+do { \
+ raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \
+} while (0)
+
+static inline void spin_lock_irq(spinlock_t *lock)
+{
+ raw_spin_lock_irq(&lock->rlock);
+}
+
+#define spin_lock_irqsave(lock, flags) \
+do { \
+ raw_spin_lock_irqsave(spinlock_check(lock), flags); \
+} while (0)
+
+#define spin_lock_irqsave_nested(lock, flags, subclass) \
+do { \
+ raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
+} while (0)
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+ raw_spin_unlock(&lock->rlock);
+}
+
+static inline void spin_unlock_bh(spinlock_t *lock)
+{
+ raw_spin_unlock_bh(&lock->rlock);
+}
+
+static inline void spin_unlock_irq(spinlock_t *lock)
+{
+ raw_spin_unlock_irq(&lock->rlock);
+}
+
+static inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+{
+ raw_spin_unlock_irqrestore(&lock->rlock, flags);
+}
+
+static inline int spin_trylock_bh(spinlock_t *lock)
+{
+ return raw_spin_trylock_bh(&lock->rlock);
+}
+
+static inline int spin_trylock_irq(spinlock_t *lock)
+{
+ return raw_spin_trylock_irq(&lock->rlock);
+}
+
+#define spin_trylock_irqsave(lock, flags) \
+({ \
+ raw_spin_trylock_irqsave(spinlock_check(lock), flags); \
+})
+
+static inline void spin_unlock_wait(spinlock_t *lock)
+{
+ raw_spin_unlock_wait(&lock->rlock);
+}
+
+static inline int spin_is_locked(spinlock_t *lock)
+{
+ return raw_spin_is_locked(&lock->rlock);
+}
+
+static inline int spin_is_contended(spinlock_t *lock)
+{
+ return raw_spin_is_contended(&lock->rlock);
+}
+
+static inline int spin_can_lock(spinlock_t *lock)
+{
+ return raw_spin_can_lock(&lock->rlock);
+}
+
+static inline void assert_spin_locked(spinlock_t *lock)
+{
+ assert_raw_spin_locked(&lock->rlock);
+}
+
/*
* Pull the atomic_t declaration:
* (asm-mips/atomic.h needs above definitions)
@@ -242,22 +390,4 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
#define atomic_dec_and_lock(atomic, lock) \
__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
-/**
- * spin_can_lock - would spin_trylock() succeed?
- * @lock: the spinlock in question.
- */
-#define spin_can_lock(lock) (!spin_is_locked(lock))
-
-/* Include rwlock functions */
-#include <linux/rwlock.h>
-
-/*
- * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
- */
-#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
-# include <linux/spinlock_api_smp.h>
-#else
-# include <linux/spinlock_api_up.h>
-#endif
-
#endif /* __LINUX_SPINLOCK_H */
diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index a2b2c9df91d..eabe5068d13 100644
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -17,26 +17,29 @@
int in_lock_functions(unsigned long addr);
-#define assert_spin_locked(x) BUG_ON(!spin_is_locked(x))
+#define assert_raw_spin_locked(x) BUG_ON(!raw_spin_is_locked(x))
-void __lockfunc _spin_lock(spinlock_t *lock) __acquires(lock);
-void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+void __lockfunc _spin_lock(raw_spinlock_t *lock) __acquires(lock);
+void __lockfunc _spin_lock_nested(raw_spinlock_t *lock, int subclass)
__acquires(lock);
-void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, struct lockdep_map *map)
+void __lockfunc
+_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
__acquires(lock);
-void __lockfunc _spin_lock_bh(spinlock_t *lock) __acquires(lock);
-void __lockfunc _spin_lock_irq(spinlock_t *lock) __acquires(lock);
+void __lockfunc _spin_lock_bh(raw_spinlock_t *lock) __acquires(lock);
+void __lockfunc _spin_lock_irq(raw_spinlock_t *lock) __acquires(lock);
-unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
+unsigned long __lockfunc _spin_lock_irqsave(raw_spinlock_t *lock)
__acquires(lock);
-unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
+unsigned long __lockfunc
+_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
__acquires(lock);
-int __lockfunc _spin_trylock(spinlock_t *lock);
-int __lockfunc _spin_trylock_bh(spinlock_t *lock);
-void __lockfunc _spin_unlock(spinlock_t *lock) __releases(lock);
-void __lockfunc _spin_unlock_bh(spinlock_t *lock) __releases(lock);
-void __lockfunc _spin_unlock_irq(spinlock_t *lock) __releases(lock);
-void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+int __lockfunc _spin_trylock(raw_spinlock_t *lock);
+int __lockfunc _spin_trylock_bh(raw_spinlock_t *lock);
+void __lockfunc _spin_unlock(raw_spinlock_t *lock) __releases(lock);
+void __lockfunc _spin_unlock_bh(raw_spinlock_t *lock) __releases(lock);
+void __lockfunc _spin_unlock_irq(raw_spinlock_t *lock) __releases(lock);
+void __lockfunc
+_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
__releases(lock);
#ifdef CONFIG_INLINE_SPIN_LOCK
@@ -79,7 +82,7 @@ void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
#define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
#endif
-static inline int __spin_trylock(spinlock_t *lock)
+static inline int __spin_trylock(raw_spinlock_t *lock)
{
preempt_disable();
if (_raw_spin_trylock(lock)) {
@@ -97,7 +100,7 @@ static inline int __spin_trylock(spinlock_t *lock)
*/
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
-static inline unsigned long __spin_lock_irqsave(spinlock_t *lock)
+static inline unsigned long __spin_lock_irqsave(raw_spinlock_t *lock)
{
unsigned long flags;
@@ -117,7 +120,7 @@ static inline unsigned long __spin_lock_irqsave(spinlock_t *lock)
return flags;
}
-static inline void __spin_lock_irq(spinlock_t *lock)
+static inline void __spin_lock_irq(raw_spinlock_t *lock)
{
local_irq_disable();
preempt_disable();
@@ -125,7 +128,7 @@ static inline void __spin_lock_irq(spinlock_t *lock)
LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}
-static inline void __spin_lock_bh(spinlock_t *lock)
+static inline void __spin_lock_bh(raw_spinlock_t *lock)
{
local_bh_disable();
preempt_disable();
@@ -133,7 +136,7 @@ static inline void __spin_lock_bh(spinlock_t *lock)
LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}
-static inline void __spin_lock(spinlock_t *lock)
+static inline void __spin_lock(raw_spinlock_t *lock)
{
preempt_disable();
spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
@@ -142,14 +145,14 @@ static inline void __spin_lock(spinlock_t *lock)
#endif /* CONFIG_PREEMPT */
-static inline void __spin_unlock(spinlock_t *lock)
+static inline void __spin_unlock(raw_spinlock_t *lock)
{
spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
preempt_enable();
}
-static inline void __spin_unlock_irqrestore(spinlock_t *lock,
+static inline void __spin_unlock_irqrestore(raw_spinlock_t *lock,
unsigned long flags)
{
spin_release(&lock->dep_map, 1, _RET_IP_);
@@ -158,7 +161,7 @@ static inline void __spin_unlock_irqrestore(spinlock_t *lock,
preempt_enable();
}
-static inline void __spin_unlock_irq(spinlock_t *lock)
+static inline void __spin_unlock_irq(raw_spinlock_t *lock)
{
spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
@@ -166,7 +169,7 @@ static inline void __spin_unlock_irq(spinlock_t *lock)
preempt_enable();
}
-static inline void __spin_unlock_bh(spinlock_t *lock)
+static inline void __spin_unlock_bh(raw_spinlock_t *lock)
{
spin_release(&lock->dep_map, 1, _RET_IP_);
_raw_spin_unlock(lock);
@@ -174,7 +177,7 @@ static inline void __spin_unlock_bh(spinlock_t *lock)
local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}
-static inline int __spin_trylock_bh(spinlock_t *lock)
+static inline int __spin_trylock_bh(raw_spinlock_t *lock)
{
local_bh_disable();
preempt_disable();
diff --git a/include/linux/spinlock_api_up.h b/include/linux/spinlock_api_up.h
index 04e1d316457..3a9e27adecf 100644
--- a/include/linux/spinlock_api_up.h
+++ b/include/linux/spinlock_api_up.h
@@ -16,7 +16,7 @@
#define in_lock_functions(ADDR) 0
-#define assert_spin_locked(lock) do { (void)(lock); } while (0)
+#define assert_raw_spin_locked(lock) do { (void)(lock); } while (0)
/*
* In the UP-nondebug case there's no real locking going on, so the
diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index 7dadce303eb..851b7783720 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -17,7 +17,7 @@
#include <linux/lockdep.h>
-typedef struct {
+typedef struct raw_spinlock {
arch_spinlock_t raw_lock;
#ifdef CONFIG_GENERIC_LOCKBREAK
unsigned int break_lock;
@@ -29,7 +29,7 @@ typedef struct {
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
-} spinlock_t;
+} raw_spinlock_t;
#define SPINLOCK_MAGIC 0xdead4ead
@@ -42,18 +42,45 @@ typedef struct {
#endif
#ifdef CONFIG_DEBUG_SPINLOCK
-# define __SPIN_LOCK_UNLOCKED(lockname) \
- (spinlock_t) { .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
- .magic = SPINLOCK_MAGIC, \
- .owner = SPINLOCK_OWNER_INIT, \
- .owner_cpu = -1, \
- SPIN_DEP_MAP_INIT(lockname) }
+# define SPIN_DEBUG_INIT(lockname) \
+ .magic = SPINLOCK_MAGIC, \
+ .owner_cpu = -1, \
+ .owner = SPINLOCK_OWNER_INIT,
#else
-# define __SPIN_LOCK_UNLOCKED(lockname) \
- (spinlock_t) { .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
- SPIN_DEP_MAP_INIT(lockname) }
+# define SPIN_DEBUG_INIT(lockname)
#endif
+#define __RAW_SPIN_LOCK_INITIALIZER(lockname) \
+ { \
+ .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED, \
+ SPIN_DEBUG_INIT(lockname) \
+ SPIN_DEP_MAP_INIT(lockname) }
+
+#define __RAW_SPIN_LOCK_UNLOCKED(lockname) \
+ (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
+
+#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
+
+typedef struct spinlock {
+ union {
+ struct raw_spinlock rlock;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
+ struct {
+ u8 __padding[LOCK_PADSIZE];
+ struct lockdep_map dep_map;
+ };
+#endif
+ };
+} spinlock_t;
+
+#define __SPIN_LOCK_INITIALIZER(lockname) \
+ { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
+
+#define __SPIN_LOCK_UNLOCKED(lockname) \
+ (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
+
/*
* SPIN_LOCK_UNLOCKED defeats lockdep state tracking and is hence
* deprecated.