1 #ifndef _ASM_X86_QSPINLOCK_H
2 #define _ASM_X86_QSPINLOCK_H
4 #include <asm/cpufeature.h>
5 #include <asm-generic/qspinlock_types.h>
6 #include <asm/paravirt.h>
8 #define queued_spin_unlock queued_spin_unlock
10 * queued_spin_unlock - release a queued spinlock
11 * @lock : Pointer to queued spinlock structure
13 * A smp_store_release() on the least-significant byte.
15 static inline void native_queued_spin_unlock(struct qspinlock *lock)
17 smp_store_release((u8 *)lock, 0);
20 #ifdef CONFIG_PARAVIRT_SPINLOCKS
21 extern void native_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
22 extern void __pv_init_lock_hash(void);
23 extern void __pv_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
24 extern void __raw_callee_save___pv_queued_spin_unlock(struct qspinlock *lock);
26 static inline void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
28 pv_queued_spin_lock_slowpath(lock, val);
31 static inline void queued_spin_unlock(struct qspinlock *lock)
33 pv_queued_spin_unlock(lock);
36 static inline void queued_spin_unlock(struct qspinlock *lock)
38 native_queued_spin_unlock(lock);
42 #define virt_queued_spin_lock virt_queued_spin_lock
44 static inline bool virt_queued_spin_lock(struct qspinlock *lock)
46 if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
49 while (atomic_cmpxchg(&lock->val, 0, _Q_LOCKED_VAL) != 0)
55 #include <asm-generic/qspinlock.h>
57 #endif /* _ASM_X86_QSPINLOCK_H */