#include <asm/spinlock.h>
int __lockfunc _spin_trylock(spinlock_t *lock);
+int __lockfunc _read_trylock(rwlock_t *lock);
int __lockfunc _write_trylock(rwlock_t *lock);
void __lockfunc _spin_lock(spinlock_t *lock) __acquires(spinlock_t);
void __lockfunc _write_unlock_bh(rwlock_t *lock) __releases(rwlock_t);
int __lockfunc _spin_trylock_bh(spinlock_t *lock);
+int __lockfunc generic_raw_read_trylock(rwlock_t *lock);
int in_lock_functions(unsigned long addr);
#else
#define _raw_read_unlock(lock) do { (void)(lock); } while(0)
#define _raw_write_lock(lock) do { (void)(lock); } while(0)
#define _raw_write_unlock(lock) do { (void)(lock); } while(0)
+#define _raw_read_trylock(lock) ({ (void)(lock); (1); })
#define _raw_write_trylock(lock) ({ (void)(lock); (1); })
#define _spin_trylock(lock) ({preempt_disable(); _raw_spin_trylock(lock) ? \
1 : ({preempt_enable(); 0;});})
+#define _read_trylock(lock) ({preempt_disable();_raw_read_trylock(lock) ? \
+ 1 : ({preempt_enable(); 0;});})
+
#define _write_trylock(lock) ({preempt_disable(); _raw_write_trylock(lock) ? \
1 : ({preempt_enable(); 0;});})
* methods are defined as nops in the case they are not required.
*/
#define spin_trylock(lock) __cond_lock(_spin_trylock(lock))
+#define read_trylock(lock) __cond_lock(_read_trylock(lock))
#define write_trylock(lock) __cond_lock(_write_trylock(lock))
-/* Where's read_trylock? */
-
#define spin_lock(lock) _spin_lock(lock)
#define write_lock(lock) _write_lock(lock)
#define read_lock(lock) _read_lock(lock)
-#define spin_unlock(lock) _spin_unlock(lock)
-#define write_unlock(lock) _write_unlock(lock)
-#define read_unlock(lock) _read_unlock(lock)
#ifdef CONFIG_SMP
#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(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 write_unlock(lock) _write_unlock(lock)
+#define read_unlock(lock) _read_unlock(lock)
+
#define spin_unlock_irqrestore(lock, flags) _spin_unlock_irqrestore(lock, flags)
#define spin_unlock_irq(lock) _spin_unlock_irq(lock)
#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
#define spin_trylock_bh(lock) __cond_lock(_spin_trylock_bh(lock))
+#define spin_trylock_irq(lock) \
+({ \
+ local_irq_disable(); \
+ _spin_trylock(lock) ? \
+ 1 : ({local_irq_enable(); 0; }); \
+})
+
+#define spin_trylock_irqsave(lock, flags) \
+({ \
+ local_irq_save(flags); \
+ _spin_trylock(lock) ? \
+ 1 : ({local_irq_restore(flags); 0;}); \
+})
+
#ifdef CONFIG_LOCKMETER
extern void _metered_spin_lock (spinlock_t *lock);
extern void _metered_spin_unlock (spinlock_t *lock);
extern void _metered_read_unlock (rwlock_t *lock);
extern void _metered_write_lock (rwlock_t *lock);
extern void _metered_write_unlock (rwlock_t *lock);
+extern int _metered_read_trylock (rwlock_t *lock);
extern int _metered_write_trylock(rwlock_t *lock);
#endif
preempt_disable();
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
while (test_and_set_bit(bitnum, addr)) {
- while (test_bit(bitnum, addr))
+ while (test_bit(bitnum, addr)) {
+ preempt_enable();
cpu_relax();
+ preempt_disable();
+ }
}
#endif
__acquire(bitlock);
#endif
}
+#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
+#define DEFINE_RWLOCK(x) rwlock_t x = RW_LOCK_UNLOCKED
+
#endif /* __LINUX_SPINLOCK_H */