locking: Split rwlock from spinlock headers

Move the rwlock defines and inlines into separate header files. This
makes the selection for -rt easier.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/rwlock.h b/include/linux/rwlock.h
new file mode 100644 (file)
index 0000000..73785b0
--- /dev/null
+++ b/include/linux/rwlock.h
@@ -0,0 +1,125 @@
+#ifndef __LINUX_RWLOCK_H
+#define __LINUX_RWLOCK_H
+
+#ifndef __LINUX_SPINLOCK_H
+# error "please don't include this file directly"
+#endif
+
+/*
+ * rwlock related methods
+ *
+ * split out from spinlock.h
+ *
+ * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
+ * Released under the General Public License (GPL).
+ */
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+  extern void __rwlock_init(rwlock_t *lock, const char *name,
+                           struct lock_class_key *key);
+# define rwlock_init(lock)                                     \
+do {                                                           \
+       static struct lock_class_key __key;                     \
+                                                               \
+       __rwlock_init((lock), #lock, &__key);                   \
+} while (0)
+#else
+# define rwlock_init(lock)                                     \
+       do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
+#endif
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+ extern void _raw_read_lock(rwlock_t *lock);
+#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
+ extern int _raw_read_trylock(rwlock_t *lock);
+ extern void _raw_read_unlock(rwlock_t *lock);
+ extern void _raw_write_lock(rwlock_t *lock);
+#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
+ extern int _raw_write_trylock(rwlock_t *lock);
+ extern void _raw_write_unlock(rwlock_t *lock);
+#else
+# define _raw_read_lock(rwlock)                __raw_read_lock(&(rwlock)->raw_lock)
+# define _raw_read_lock_flags(lock, flags) \
+               __raw_read_lock_flags(&(lock)->raw_lock, *(flags))
+# define _raw_read_trylock(rwlock)     __raw_read_trylock(&(rwlock)->raw_lock)
+# define _raw_read_unlock(rwlock)      __raw_read_unlock(&(rwlock)->raw_lock)
+# define _raw_write_lock(rwlock)       __raw_write_lock(&(rwlock)->raw_lock)
+# define _raw_write_lock_flags(lock, flags) \
+               __raw_write_lock_flags(&(lock)->raw_lock, *(flags))
+# define _raw_write_trylock(rwlock)    __raw_write_trylock(&(rwlock)->raw_lock)
+# define _raw_write_unlock(rwlock)     __raw_write_unlock(&(rwlock)->raw_lock)
+#endif
+
+#define read_can_lock(rwlock)          __raw_read_can_lock(&(rwlock)->raw_lock)
+#define write_can_lock(rwlock)         __raw_write_can_lock(&(rwlock)->raw_lock)
+
+/*
+ * Define the various rw_lock methods.  Note we define these
+ * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
+ * methods are defined as nops in the case they are not required.
+ */
+#define read_trylock(lock)             __cond_lock(lock, _read_trylock(lock))
+#define write_trylock(lock)            __cond_lock(lock, _write_trylock(lock))
+
+#define write_lock(lock)               _write_lock(lock)
+#define read_lock(lock)                        _read_lock(lock)
+
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+
+#define read_lock_irqsave(lock, flags)                 \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               flags = _read_lock_irqsave(lock);       \
+       } while (0)
+#define write_lock_irqsave(lock, flags)                        \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               flags = _write_lock_irqsave(lock);      \
+       } while (0)
+
+#else
+
+#define read_lock_irqsave(lock, flags)                 \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               _read_lock_irqsave(lock, flags);        \
+       } while (0)
+#define write_lock_irqsave(lock, flags)                        \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               _write_lock_irqsave(lock, flags);       \
+       } while (0)
+
+#endif
+
+#define read_lock_irq(lock)            _read_lock_irq(lock)
+#define read_lock_bh(lock)             _read_lock_bh(lock)
+#define write_lock_irq(lock)           _write_lock_irq(lock)
+#define write_lock_bh(lock)            _write_lock_bh(lock)
+#define read_unlock(lock)              _read_unlock(lock)
+#define write_unlock(lock)             _write_unlock(lock)
+#define read_unlock_irq(lock)          _read_unlock_irq(lock)
+#define write_unlock_irq(lock)         _write_unlock_irq(lock)
+
+#define read_unlock_irqrestore(lock, flags)            \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               _read_unlock_irqrestore(lock, flags);   \
+       } while (0)
+#define read_unlock_bh(lock)           _read_unlock_bh(lock)
+
+#define write_unlock_irqrestore(lock, flags)           \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               _write_unlock_irqrestore(lock, flags);  \
+       } while (0)
+#define write_unlock_bh(lock)          _write_unlock_bh(lock)
+
+#define write_trylock_irqsave(lock, flags) \
+({ \
+       local_irq_save(flags); \
+       write_trylock(lock) ? \
+       1 : ({ local_irq_restore(flags); 0; }); \
+})
+
+#endif /* __LINUX_RWLOCK_H */

diff --git a/include/linux/rwlock_types.h b/include/linux/rwlock_types.h
new file mode 100644 (file)
index 0000000..f8c9352
--- /dev/null
+++ b/include/linux/rwlock_types.h
@@ -0,0 +1,56 @@
+#ifndef __LINUX_RWLOCK_TYPES_H
+#define __LINUX_RWLOCK_TYPES_H
+
+/*
+ * include/linux/rwlock_types.h - generic rwlock type definitions
+ *                               and initializers
+ *
+ * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
+ * Released under the General Public License (GPL).
+ */
+typedef struct {
+       raw_rwlock_t raw_lock;
+#ifdef CONFIG_GENERIC_LOCKBREAK
+       unsigned int break_lock;
+#endif
+#ifdef CONFIG_DEBUG_SPINLOCK
+       unsigned int magic, owner_cpu;
+       void *owner;
+#endif
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map dep_map;
+#endif
+} rwlock_t;
+
+#define RWLOCK_MAGIC           0xdeaf1eed
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define RW_DEP_MAP_INIT(lockname)     .dep_map = { .name = #lockname }
+#else
+# define RW_DEP_MAP_INIT(lockname)
+#endif
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+#define __RW_LOCK_UNLOCKED(lockname)                                   \
+       (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
+                               .magic = RWLOCK_MAGIC,                  \
+                               .owner = SPINLOCK_OWNER_INIT,           \
+                               .owner_cpu = -1,                        \
+                               RW_DEP_MAP_INIT(lockname) }
+#else
+#define __RW_LOCK_UNLOCKED(lockname) \
+       (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
+                               RW_DEP_MAP_INIT(lockname) }
+#endif
+
+/*
+ * RW_LOCK_UNLOCKED defeat lockdep state tracking and is hence
+ * deprecated.
+ *
+ * Please use DEFINE_RWLOCK() or __RW_LOCK_UNLOCKED() as appropriate.
+ */
+#define RW_LOCK_UNLOCKED       __RW_LOCK_UNLOCKED(old_style_rw_init)
+
+#define DEFINE_RWLOCK(x)       rwlock_t x = __RW_LOCK_UNLOCKED(x)
+
+#endif /* __LINUX_RWLOCK_TYPES_H */

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 71dccfe..a9aaa70 100644 (file)
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -103,20 +103,6 @@ do {                                                               \
        do { *(lock) = __SPIN_LOCK_UNLOCKED(lock); } while (0)
 #endif
 
-#ifdef CONFIG_DEBUG_SPINLOCK
-  extern void __rwlock_init(rwlock_t *lock, const char *name,
-                           struct lock_class_key *key);
-# define rwlock_init(lock)                                     \
-do {                                                           \
-       static struct lock_class_key __key;                     \
-                                                               \
-       __rwlock_init((lock), #lock, &__key);                   \
-} while (0)
-#else
-# define rwlock_init(lock)                                     \
-       do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
-#endif
-
 #define spin_is_locked(lock)   __raw_spin_is_locked(&(lock)->raw_lock)
 
 #ifdef CONFIG_GENERIC_LOCKBREAK
@@ -146,43 +132,21 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
 #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 void _raw_read_lock(rwlock_t *lock);
-#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
- extern int _raw_read_trylock(rwlock_t *lock);
- extern void _raw_read_unlock(rwlock_t *lock);
- extern void _raw_write_lock(rwlock_t *lock);
-#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
- extern int _raw_write_trylock(rwlock_t *lock);
- extern void _raw_write_unlock(rwlock_t *lock);
 #else
 # define _raw_spin_lock(lock)          __raw_spin_lock(&(lock)->raw_lock)
 # define _raw_spin_lock_flags(lock, flags) \
                __raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
 # define _raw_spin_trylock(lock)       __raw_spin_trylock(&(lock)->raw_lock)
 # define _raw_spin_unlock(lock)                __raw_spin_unlock(&(lock)->raw_lock)
-# define _raw_read_lock(rwlock)                __raw_read_lock(&(rwlock)->raw_lock)
-# define _raw_read_lock_flags(lock, flags) \
-               __raw_read_lock_flags(&(lock)->raw_lock, *(flags))
-# define _raw_read_trylock(rwlock)     __raw_read_trylock(&(rwlock)->raw_lock)
-# define _raw_read_unlock(rwlock)      __raw_read_unlock(&(rwlock)->raw_lock)
-# define _raw_write_lock(rwlock)       __raw_write_lock(&(rwlock)->raw_lock)
-# define _raw_write_lock_flags(lock, flags) \
-               __raw_write_lock_flags(&(lock)->raw_lock, *(flags))
-# define _raw_write_trylock(rwlock)    __raw_write_trylock(&(rwlock)->raw_lock)
-# define _raw_write_unlock(rwlock)     __raw_write_unlock(&(rwlock)->raw_lock)
 #endif
 
-#define read_can_lock(rwlock)          __raw_read_can_lock(&(rwlock)->raw_lock)
-#define write_can_lock(rwlock)         __raw_write_can_lock(&(rwlock)->raw_lock)
-
 /*
- * Define the various spin_lock and rw_lock methods.  Note we define these
- * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
- * methods are defined as nops in the case they are not required.
+ * Define the various spin_lock methods.  Note we define these
+ * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
+ * various methods are defined as nops in the case they are not
+ * required.
  */
 #define spin_trylock(lock)             __cond_lock(lock, _spin_trylock(lock))
-#define read_trylock(lock)             __cond_lock(lock, _read_trylock(lock))
-#define write_trylock(lock)            __cond_lock(lock, _write_trylock(lock))
 
 #define spin_lock(lock)                        _spin_lock(lock)
 
@@ -198,9 +162,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
 # define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
 #endif
 
-#define write_lock(lock)               _write_lock(lock)
-#define read_lock(lock)                        _read_lock(lock)
-
 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
 
 #define spin_lock_irqsave(lock, flags)                 \
@@ -208,16 +169,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
                typecheck(unsigned long, flags);        \
                flags = _spin_lock_irqsave(lock);       \
        } while (0)
-#define read_lock_irqsave(lock, flags)                 \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               flags = _read_lock_irqsave(lock);       \
-       } while (0)
-#define write_lock_irqsave(lock, flags)                        \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               flags = _write_lock_irqsave(lock);      \
-       } while (0)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 #define spin_lock_irqsave_nested(lock, flags, subclass)                        \
@@ -240,16 +191,7 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
                typecheck(unsigned long, flags);        \
                _spin_lock_irqsave(lock, flags);        \
        } while (0)
-#define read_lock_irqsave(lock, flags)                 \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               _read_lock_irqsave(lock, flags);        \
-       } while (0)
-#define write_lock_irqsave(lock, flags)                        \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               _write_lock_irqsave(lock, flags);       \
-       } while (0)
+
 #define spin_lock_irqsave_nested(lock, flags, subclass)        \
        spin_lock_irqsave(lock, flags)
 
@@ -257,16 +199,8 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
 
 #define spin_lock_irq(lock)            _spin_lock_irq(lock)
 #define spin_lock_bh(lock)             _spin_lock_bh(lock)
-#define read_lock_irq(lock)            _read_lock_irq(lock)
-#define read_lock_bh(lock)             _read_lock_bh(lock)
-#define write_lock_irq(lock)           _write_lock_irq(lock)
-#define write_lock_bh(lock)            _write_lock_bh(lock)
 #define spin_unlock(lock)              _spin_unlock(lock)
-#define read_unlock(lock)              _read_unlock(lock)
-#define write_unlock(lock)             _write_unlock(lock)
 #define spin_unlock_irq(lock)          _spin_unlock_irq(lock)
-#define read_unlock_irq(lock)          _read_unlock_irq(lock)
-#define write_unlock_irq(lock)         _write_unlock_irq(lock)
 
 #define spin_unlock_irqrestore(lock, flags)            \
        do {                                            \
@@ -275,20 +209,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
        } while (0)
 #define spin_unlock_bh(lock)           _spin_unlock_bh(lock)
 
-#define read_unlock_irqrestore(lock, flags)            \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               _read_unlock_irqrestore(lock, flags);   \
-       } while (0)
-#define read_unlock_bh(lock)           _read_unlock_bh(lock)
-
-#define write_unlock_irqrestore(lock, flags)           \
-       do {                                            \
-               typecheck(unsigned long, flags);        \
-               _write_unlock_irqrestore(lock, flags);  \
-       } while (0)
-#define write_unlock_bh(lock)          _write_unlock_bh(lock)
-
 #define spin_trylock_bh(lock)  __cond_lock(lock, _spin_trylock_bh(lock))
 
 #define spin_trylock_irq(lock) \
@@ -305,13 +225,6 @@ static inline void smp_mb__after_lock(void) { smp_mb(); }
        1 : ({ local_irq_restore(flags); 0; }); \
 })
 
-#define write_trylock_irqsave(lock, flags) \
-({ \
-       local_irq_save(flags); \
-       write_trylock(lock) ? \
-       1 : ({ local_irq_restore(flags); 0; }); \
-})
-
 /*
  * Pull the atomic_t declaration:
  * (asm-mips/atomic.h needs above definitions)
@@ -335,6 +248,9 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
  */
 #define spin_can_lock(lock)    (!spin_is_locked(lock))
 
+/* Include rwlock functions */
+#include <linux/rwlock.h>
+
 /*
  * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
  */

diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index 68d88f7..f979d5d 100644 (file)
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -33,22 +33,6 @@ typedef struct {
 
 #define SPINLOCK_MAGIC         0xdead4ead
 
-typedef struct {
-       raw_rwlock_t raw_lock;
-#ifdef CONFIG_GENERIC_LOCKBREAK
-       unsigned int break_lock;
-#endif
-#ifdef CONFIG_DEBUG_SPINLOCK
-       unsigned int magic, owner_cpu;
-       void *owner;
-#endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-       struct lockdep_map dep_map;
-#endif
-} rwlock_t;
-
-#define RWLOCK_MAGIC           0xdeaf1eed
-
 #define SPINLOCK_OWNER_INIT    ((void *)-1L)
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -57,12 +41,6 @@ typedef struct {
 # define SPIN_DEP_MAP_INIT(lockname)
 #endif
 
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define RW_DEP_MAP_INIT(lockname)     .dep_map = { .name = #lockname }
-#else
-# define RW_DEP_MAP_INIT(lockname)
-#endif
-
 #ifdef CONFIG_DEBUG_SPINLOCK
 # define __SPIN_LOCK_UNLOCKED(lockname)                                        \
        (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED,   \
@@ -70,31 +48,22 @@ typedef struct {
                                .owner = SPINLOCK_OWNER_INIT,           \
                                .owner_cpu = -1,                        \
                                SPIN_DEP_MAP_INIT(lockname) }
-#define __RW_LOCK_UNLOCKED(lockname)                                   \
-       (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
-                               .magic = RWLOCK_MAGIC,                  \
-                               .owner = SPINLOCK_OWNER_INIT,           \
-                               .owner_cpu = -1,                        \
-                               RW_DEP_MAP_INIT(lockname) }
 #else
 # define __SPIN_LOCK_UNLOCKED(lockname) \
        (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED,   \
                                SPIN_DEP_MAP_INIT(lockname) }
-#define __RW_LOCK_UNLOCKED(lockname) \
-       (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
-                               RW_DEP_MAP_INIT(lockname) }
 #endif
 
 /*
- * SPIN_LOCK_UNLOCKED and RW_LOCK_UNLOCKED defeat lockdep state tracking and
- * are hence deprecated.
- * Please use DEFINE_SPINLOCK()/DEFINE_RWLOCK() or
- * __SPIN_LOCK_UNLOCKED()/__RW_LOCK_UNLOCKED() as appropriate.
+ * SPIN_LOCK_UNLOCKED defeats lockdep state tracking and is hence
+ * deprecated.
+ * Please use DEFINE_SPINLOCK() or __SPIN_LOCK_UNLOCKED() as
+ * appropriate.
  */
 #define SPIN_LOCK_UNLOCKED     __SPIN_LOCK_UNLOCKED(old_style_spin_init)
-#define RW_LOCK_UNLOCKED       __RW_LOCK_UNLOCKED(old_style_rw_init)
 
 #define DEFINE_SPINLOCK(x)     spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
-#define DEFINE_RWLOCK(x)       rwlock_t x = __RW_LOCK_UNLOCKED(x)
+
+#include <linux/rwlock_types.h>
 
 #endif /* __LINUX_SPINLOCK_TYPES_H */