#ifndef __ASM_SPINLOCK_H
#define __ASM_SPINLOCK_H
+#include <linux/smp.h>
+
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
static inline int
* (the type definitions are in asm/spinlock_types.h)
*/
-#define __raw_spin_is_locked(x) ((x)->lock != 0)
-#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+#define __raw_spin_is_locked(x) ((x)->owner_cpu != 0)
#define __raw_spin_unlock_wait(lock) \
- do { while (__raw_spin_is_locked(lock)) cpu_relax(); } while (0)
+ do { while (__raw_spin_is_locked(lock)) \
+ _raw_spin_relax(lock); } while (0)
-extern void _raw_spin_lock_wait(raw_spinlock_t *lp, unsigned int pc);
-extern int _raw_spin_trylock_retry(raw_spinlock_t *lp, unsigned int pc);
+extern void _raw_spin_lock_wait(raw_spinlock_t *);
+extern void _raw_spin_lock_wait_flags(raw_spinlock_t *, unsigned long flags);
+extern int _raw_spin_trylock_retry(raw_spinlock_t *);
+extern void _raw_spin_relax(raw_spinlock_t *lock);
static inline void __raw_spin_lock(raw_spinlock_t *lp)
{
- unsigned long pc = 1 | (unsigned long) __builtin_return_address(0);
+ int old;
+
+ old = _raw_compare_and_swap(&lp->owner_cpu, 0, ~smp_processor_id());
+ if (likely(old == 0))
+ return;
+ _raw_spin_lock_wait(lp);
+}
+
+static inline void __raw_spin_lock_flags(raw_spinlock_t *lp,
+ unsigned long flags)
+{
+ int old;
- if (unlikely(_raw_compare_and_swap(&lp->lock, 0, pc) != 0))
- _raw_spin_lock_wait(lp, pc);
+ old = _raw_compare_and_swap(&lp->owner_cpu, 0, ~smp_processor_id());
+ if (likely(old == 0))
+ return;
+ _raw_spin_lock_wait_flags(lp, flags);
}
static inline int __raw_spin_trylock(raw_spinlock_t *lp)
{
- unsigned long pc = 1 | (unsigned long) __builtin_return_address(0);
+ int old;
- if (likely(_raw_compare_and_swap(&lp->lock, 0, pc) == 0))
+ old = _raw_compare_and_swap(&lp->owner_cpu, 0, ~smp_processor_id());
+ if (likely(old == 0))
return 1;
- return _raw_spin_trylock_retry(lp, pc);
+ return _raw_spin_trylock_retry(lp);
}
static inline void __raw_spin_unlock(raw_spinlock_t *lp)
{
- _raw_compare_and_swap(&lp->lock, lp->lock, 0);
+ _raw_compare_and_swap(&lp->owner_cpu, lp->owner_cpu, 0);
}
/*
return _raw_write_trylock_retry(rw);
}
+#define _raw_read_relax(lock) cpu_relax()
+#define _raw_write_relax(lock) cpu_relax()
+
#endif /* __ASM_SPINLOCK_H */