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authorThomas Gleixner <tglx@linutronix.de>2009-11-16 18:48:37 +0100
committerThomas Gleixner <tglx@linutronix.de>2009-12-14 23:55:32 +0100
commit6b6b4792f89346e47437682c7ba3438e6681c0f9 (patch)
tree3c3cc94369bc5edaeb5ec8b67c8e172708fdf496 /include/linux/rwlock_api_smp.h
parentef12f10994281e2e44526fa0abf23fdd7d5bd87f (diff)
locking: Separate rwlock api from spinlock api
Move the rwlock smp api defines and functions into a separate header file. Makes the -rt selection simpler and less intrusive. 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>
Diffstat (limited to 'include/linux/rwlock_api_smp.h')
-rw-r--r--include/linux/rwlock_api_smp.h277
1 files changed, 277 insertions, 0 deletions
diff --git a/include/linux/rwlock_api_smp.h b/include/linux/rwlock_api_smp.h
new file mode 100644
index 000000000000..090f876f828d
--- /dev/null
+++ b/include/linux/rwlock_api_smp.h
@@ -0,0 +1,277 @@
+#ifndef __LINUX_RWLOCK_API_SMP_H
+#define __LINUX_RWLOCK_API_SMP_H
+
+#ifndef __LINUX_SPINLOCK_API_SMP_H
+# error "please don't include this file directly"
+#endif
+
+/*
+ * include/linux/rwlock_api_smp.h
+ *
+ * spinlock API declarations on SMP (and debug)
+ * (implemented in kernel/spinlock.c)
+ *
+ * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
+ * Released under the General Public License (GPL).
+ */
+
+void __lockfunc _read_lock(rwlock_t *lock) __acquires(lock);
+void __lockfunc _write_lock(rwlock_t *lock) __acquires(lock);
+void __lockfunc _read_lock_bh(rwlock_t *lock) __acquires(lock);
+void __lockfunc _write_lock_bh(rwlock_t *lock) __acquires(lock);
+void __lockfunc _read_lock_irq(rwlock_t *lock) __acquires(lock);
+void __lockfunc _write_lock_irq(rwlock_t *lock) __acquires(lock);
+unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
+ __acquires(lock);
+unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
+ __acquires(lock);
+int __lockfunc _read_trylock(rwlock_t *lock);
+int __lockfunc _write_trylock(rwlock_t *lock);
+void __lockfunc _read_unlock(rwlock_t *lock) __releases(lock);
+void __lockfunc _write_unlock(rwlock_t *lock) __releases(lock);
+void __lockfunc _read_unlock_bh(rwlock_t *lock) __releases(lock);
+void __lockfunc _write_unlock_bh(rwlock_t *lock) __releases(lock);
+void __lockfunc _read_unlock_irq(rwlock_t *lock) __releases(lock);
+void __lockfunc _write_unlock_irq(rwlock_t *lock) __releases(lock);
+void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+ __releases(lock);
+void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+ __releases(lock);
+
+#ifdef CONFIG_INLINE_READ_LOCK
+#define _read_lock(lock) __read_lock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_LOCK
+#define _write_lock(lock) __write_lock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_LOCK_BH
+#define _read_lock_bh(lock) __read_lock_bh(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_LOCK_BH
+#define _write_lock_bh(lock) __write_lock_bh(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_LOCK_IRQ
+#define _read_lock_irq(lock) __read_lock_irq(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
+#define _write_lock_irq(lock) __write_lock_irq(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
+#define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
+#define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_TRYLOCK
+#define _read_trylock(lock) __read_trylock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_TRYLOCK
+#define _write_trylock(lock) __write_trylock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_UNLOCK
+#define _read_unlock(lock) __read_unlock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_UNLOCK
+#define _write_unlock(lock) __write_unlock(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_UNLOCK_BH
+#define _read_unlock_bh(lock) __read_unlock_bh(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
+#define _write_unlock_bh(lock) __write_unlock_bh(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
+#define _read_unlock_irq(lock) __read_unlock_irq(lock)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
+#define _write_unlock_irq(lock) __write_unlock_irq(lock)
+#endif
+
+#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
+#define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
+#endif
+
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
+#define _write_unlock_irqrestore(lock, flags) __write_unlock_irqrestore(lock, flags)
+#endif
+
+static inline int __read_trylock(rwlock_t *lock)
+{
+ preempt_disable();
+ if (_raw_read_trylock(lock)) {
+ rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
+ return 1;
+ }
+ preempt_enable();
+ return 0;
+}
+
+static inline int __write_trylock(rwlock_t *lock)
+{
+ preempt_disable();
+ if (_raw_write_trylock(lock)) {
+ rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+ return 1;
+ }
+ preempt_enable();
+ return 0;
+}
+
+/*
+ * If lockdep is enabled then we use the non-preemption spin-ops
+ * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
+ * not re-enabled during lock-acquire (which the preempt-spin-ops do):
+ */
+#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
+
+static inline void __read_lock(rwlock_t *lock)
+{
+ preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
+}
+
+static inline unsigned long __read_lock_irqsave(rwlock_t *lock)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
+ _raw_read_lock_flags, &flags);
+ return flags;
+}
+
+static inline void __read_lock_irq(rwlock_t *lock)
+{
+ local_irq_disable();
+ preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
+}
+
+static inline void __read_lock_bh(rwlock_t *lock)
+{
+ local_bh_disable();
+ preempt_disable();
+ rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
+}
+
+static inline unsigned long __write_lock_irqsave(rwlock_t *lock)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
+ _raw_write_lock_flags, &flags);
+ return flags;
+}
+
+static inline void __write_lock_irq(rwlock_t *lock)
+{
+ local_irq_disable();
+ preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
+}
+
+static inline void __write_lock_bh(rwlock_t *lock)
+{
+ local_bh_disable();
+ preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
+}
+
+static inline void __write_lock(rwlock_t *lock)
+{
+ preempt_disable();
+ rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+ LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
+}
+
+#endif /* CONFIG_PREEMPT */
+
+static inline void __write_unlock(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_write_unlock(lock);
+ preempt_enable();
+}
+
+static inline void __read_unlock(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_read_unlock(lock);
+ preempt_enable();
+}
+
+static inline void __read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_read_unlock(lock);
+ local_irq_restore(flags);
+ preempt_enable();
+}
+
+static inline void __read_unlock_irq(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_read_unlock(lock);
+ local_irq_enable();
+ preempt_enable();
+}
+
+static inline void __read_unlock_bh(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_read_unlock(lock);
+ preempt_enable_no_resched();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
+}
+
+static inline void __write_unlock_irqrestore(rwlock_t *lock,
+ unsigned long flags)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_write_unlock(lock);
+ local_irq_restore(flags);
+ preempt_enable();
+}
+
+static inline void __write_unlock_irq(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_write_unlock(lock);
+ local_irq_enable();
+ preempt_enable();
+}
+
+static inline void __write_unlock_bh(rwlock_t *lock)
+{
+ rwlock_release(&lock->dep_map, 1, _RET_IP_);
+ _raw_write_unlock(lock);
+ preempt_enable_no_resched();
+ local_bh_enable_ip((unsigned long)__builtin_return_address(0));
+}
+
+#endif /* __LINUX_RWLOCK_API_SMP_H */