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@@ -1,6 +1,7 @@
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#ifndef _ASM_X86_QSPINLOCK_H
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#define _ASM_X86_QSPINLOCK_H
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+#include <asm/cpufeature.h>
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#include <asm-generic/qspinlock_types.h>
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#define queued_spin_unlock queued_spin_unlock
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@@ -15,6 +16,19 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
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smp_store_release((u8 *)lock, 0);
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}
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+#define virt_queued_spin_lock virt_queued_spin_lock
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+
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+static inline bool virt_queued_spin_lock(struct qspinlock *lock)
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+{
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+ if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
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+ return false;
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+
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+ while (atomic_cmpxchg(&lock->val, 0, _Q_LOCKED_VAL) != 0)
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+ cpu_relax();
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+
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+ return true;
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+}
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+
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#include <asm-generic/qspinlock.h>
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#endif /* _ASM_X86_QSPINLOCK_H */
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