locking: Implement new raw_spinlock
Thomas Gleixner [Wed, 2 Dec 2009 19:02:59 +0000 (20:02 +0100)]
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>

include/linux/spinlock.h
include/linux/spinlock_api_smp.h
include/linux/spinlock_api_up.h
include/linux/spinlock_types.h
kernel/mutex-debug.h
kernel/sched.c
kernel/spinlock.c
lib/spinlock_debug.c

index 53bc221..ef5a55d 100644 (file)
@@ -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>
 #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 */
index a2b2c9d..eabe506 100644 (file)
 
 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();
index 04e1d31..3a9e27a 100644 (file)
@@ -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
index 7dadce3..851b778 100644 (file)
@@ -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.
index 7bebbd1..57d527a 100644 (file)
@@ -43,13 +43,13 @@ static inline void mutex_clear_owner(struct mutex *lock)
                                                        \
                DEBUG_LOCKS_WARN_ON(in_interrupt());    \
                local_irq_save(flags);                  \
-               arch_spin_lock(&(lock)->raw_lock);      \
+               arch_spin_lock(&(lock)->rlock.raw_lock);\
                DEBUG_LOCKS_WARN_ON(l->magic != l);     \
        } while (0)
 
-#define spin_unlock_mutex(lock, flags)                 \
-       do {                                            \
-               arch_spin_unlock(&(lock)->raw_lock);    \
-               local_irq_restore(flags);               \
-               preempt_check_resched();                \
+#define spin_unlock_mutex(lock, flags)                         \
+       do {                                                    \
+               arch_spin_unlock(&(lock)->rlock.raw_lock);      \
+               local_irq_restore(flags);                       \
+               preempt_check_resched();                        \
        } while (0)
index fd05861..e6acf2d 100644 (file)
@@ -884,7 +884,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 {
 #ifdef CONFIG_DEBUG_SPINLOCK
        /* this is a valid case when another task releases the spinlock */
-       rq->lock.owner = current;
+       rq->lock.rlock.owner = current;
 #endif
        /*
         * If we are tracking spinlock dependencies then we have to
index fbb5f8b..54eb7dd 100644 (file)
@@ -32,6 +32,8 @@
  * include/linux/spinlock_api_smp.h
  */
 #else
+#define raw_read_can_lock(l)   read_can_lock(l)
+#define raw_write_can_lock(l)  write_can_lock(l)
 /*
  * We build the __lock_function inlines here. They are too large for
  * inlining all over the place, but here is only one user per function
@@ -52,7 +54,7 @@ void __lockfunc __##op##_lock(locktype##_t *lock)                     \
                                                                        \
                if (!(lock)->break_lock)                                \
                        (lock)->break_lock = 1;                         \
-               while (!op##_can_lock(lock) && (lock)->break_lock)      \
+               while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
                        arch_##op##_relax(&lock->raw_lock);             \
        }                                                               \
        (lock)->break_lock = 0;                                         \
@@ -72,7 +74,7 @@ unsigned long __lockfunc __##op##_lock_irqsave(locktype##_t *lock)    \
                                                                        \
                if (!(lock)->break_lock)                                \
                        (lock)->break_lock = 1;                         \
-               while (!op##_can_lock(lock) && (lock)->break_lock)      \
+               while (!raw_##op##_can_lock(lock) && (lock)->break_lock)\
                        arch_##op##_relax(&lock->raw_lock);             \
        }                                                               \
        (lock)->break_lock = 0;                                         \
@@ -107,14 +109,14 @@ void __lockfunc __##op##_lock_bh(locktype##_t *lock)                      \
  *         __[spin|read|write]_lock_irqsave()
  *         __[spin|read|write]_lock_bh()
  */
-BUILD_LOCK_OPS(spin, spinlock);
+BUILD_LOCK_OPS(spin, raw_spinlock);
 BUILD_LOCK_OPS(read, rwlock);
 BUILD_LOCK_OPS(write, rwlock);
 
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_TRYLOCK
-int __lockfunc _spin_trylock(spinlock_t *lock)
+int __lockfunc _spin_trylock(raw_spinlock_t *lock)
 {
        return __spin_trylock(lock);
 }
@@ -122,7 +124,7 @@ EXPORT_SYMBOL(_spin_trylock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_TRYLOCK_BH
-int __lockfunc _spin_trylock_bh(spinlock_t *lock)
+int __lockfunc _spin_trylock_bh(raw_spinlock_t *lock)
 {
        return __spin_trylock_bh(lock);
 }
@@ -130,7 +132,7 @@ EXPORT_SYMBOL(_spin_trylock_bh);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK
-void __lockfunc _spin_lock(spinlock_t *lock)
+void __lockfunc _spin_lock(raw_spinlock_t *lock)
 {
        __spin_lock(lock);
 }
@@ -138,7 +140,7 @@ EXPORT_SYMBOL(_spin_lock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
-unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock)
+unsigned long __lockfunc _spin_lock_irqsave(raw_spinlock_t *lock)
 {
        return __spin_lock_irqsave(lock);
 }
@@ -146,7 +148,7 @@ EXPORT_SYMBOL(_spin_lock_irqsave);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_IRQ
-void __lockfunc _spin_lock_irq(spinlock_t *lock)
+void __lockfunc _spin_lock_irq(raw_spinlock_t *lock)
 {
        __spin_lock_irq(lock);
 }
@@ -154,7 +156,7 @@ EXPORT_SYMBOL(_spin_lock_irq);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_LOCK_BH
-void __lockfunc _spin_lock_bh(spinlock_t *lock)
+void __lockfunc _spin_lock_bh(raw_spinlock_t *lock)
 {
        __spin_lock_bh(lock);
 }
@@ -162,7 +164,7 @@ EXPORT_SYMBOL(_spin_lock_bh);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK
-void __lockfunc _spin_unlock(spinlock_t *lock)
+void __lockfunc _spin_unlock(raw_spinlock_t *lock)
 {
        __spin_unlock(lock);
 }
@@ -170,7 +172,7 @@ EXPORT_SYMBOL(_spin_unlock);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
-void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
+void __lockfunc _spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
 {
        __spin_unlock_irqrestore(lock, flags);
 }
@@ -178,7 +180,7 @@ EXPORT_SYMBOL(_spin_unlock_irqrestore);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_IRQ
-void __lockfunc _spin_unlock_irq(spinlock_t *lock)
+void __lockfunc _spin_unlock_irq(raw_spinlock_t *lock)
 {
        __spin_unlock_irq(lock);
 }
@@ -186,7 +188,7 @@ EXPORT_SYMBOL(_spin_unlock_irq);
 #endif
 
 #ifndef CONFIG_INLINE_SPIN_UNLOCK_BH
-void __lockfunc _spin_unlock_bh(spinlock_t *lock)
+void __lockfunc _spin_unlock_bh(raw_spinlock_t *lock)
 {
        __spin_unlock_bh(lock);
 }
@@ -339,7 +341,7 @@ EXPORT_SYMBOL(_write_unlock_bh);
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 
-void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
+void __lockfunc _spin_lock_nested(raw_spinlock_t *lock, int subclass)
 {
        preempt_disable();
        spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
@@ -347,7 +349,7 @@ void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass)
 }
 EXPORT_SYMBOL(_spin_lock_nested);
 
-unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
+unsigned long __lockfunc _spin_lock_irqsave_nested(raw_spinlock_t *lock,
                                                   int subclass)
 {
        unsigned long flags;
@@ -361,7 +363,7 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock,
 }
 EXPORT_SYMBOL(_spin_lock_irqsave_nested);
 
-void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
+void __lockfunc _spin_lock_nest_lock(raw_spinlock_t *lock,
                                     struct lockdep_map *nest_lock)
 {
        preempt_disable();
index 0cea0bf..e705848 100644 (file)
@@ -13,8 +13,8 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 
-void __spin_lock_init(spinlock_t *lock, const char *name,
-                     struct lock_class_key *key)
+void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
+                         struct lock_class_key *key)
 {
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
        /*
@@ -29,7 +29,7 @@ void __spin_lock_init(spinlock_t *lock, const char *name,
        lock->owner_cpu = -1;
 }
 
-EXPORT_SYMBOL(__spin_lock_init);
+EXPORT_SYMBOL(__raw_spin_lock_init);
 
 void __rwlock_init(rwlock_t *lock, const char *name,
                   struct lock_class_key *key)
@@ -49,7 +49,7 @@ void __rwlock_init(rwlock_t *lock, const char *name,
 
 EXPORT_SYMBOL(__rwlock_init);
 
-static void spin_bug(spinlock_t *lock, const char *msg)
+static void spin_bug(raw_spinlock_t *lock, const char *msg)
 {
        struct task_struct *owner = NULL;
 
@@ -73,7 +73,7 @@ static void spin_bug(spinlock_t *lock, const char *msg)
 #define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)
 
 static inline void
-debug_spin_lock_before(spinlock_t *lock)
+debug_spin_lock_before(raw_spinlock_t *lock)
 {
        SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
        SPIN_BUG_ON(lock->owner == current, lock, "recursion");
@@ -81,16 +81,16 @@ debug_spin_lock_before(spinlock_t *lock)
                                                        lock, "cpu recursion");
 }
 
-static inline void debug_spin_lock_after(spinlock_t *lock)
+static inline void debug_spin_lock_after(raw_spinlock_t *lock)
 {
        lock->owner_cpu = raw_smp_processor_id();
        lock->owner = current;
 }
 
-static inline void debug_spin_unlock(spinlock_t *lock)
+static inline void debug_spin_unlock(raw_spinlock_t *lock)
 {
        SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");
-       SPIN_BUG_ON(!spin_is_locked(lock), lock, "already unlocked");
+       SPIN_BUG_ON(!raw_spin_is_locked(lock), lock, "already unlocked");
        SPIN_BUG_ON(lock->owner != current, lock, "wrong owner");
        SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),
                                                        lock, "wrong CPU");
@@ -98,7 +98,7 @@ static inline void debug_spin_unlock(spinlock_t *lock)
        lock->owner_cpu = -1;
 }
 
-static void __spin_lock_debug(spinlock_t *lock)
+static void __spin_lock_debug(raw_spinlock_t *lock)
 {
        u64 i;
        u64 loops = loops_per_jiffy * HZ;
@@ -125,7 +125,7 @@ static void __spin_lock_debug(spinlock_t *lock)
        }
 }
 
-void _raw_spin_lock(spinlock_t *lock)
+void _raw_spin_lock(raw_spinlock_t *lock)
 {
        debug_spin_lock_before(lock);
        if (unlikely(!arch_spin_trylock(&lock->raw_lock)))
@@ -133,7 +133,7 @@ void _raw_spin_lock(spinlock_t *lock)
        debug_spin_lock_after(lock);
 }
 
-int _raw_spin_trylock(spinlock_t *lock)
+int _raw_spin_trylock(raw_spinlock_t *lock)
 {
        int ret = arch_spin_trylock(&lock->raw_lock);
 
@@ -148,7 +148,7 @@ int _raw_spin_trylock(spinlock_t *lock)
        return ret;
 }
 
-void _raw_spin_unlock(spinlock_t *lock)
+void _raw_spin_unlock(raw_spinlock_t *lock)
 {
        debug_spin_unlock(lock);
        arch_spin_unlock(&lock->raw_lock);