1 files changed, 60 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
new file mode 100644
index 00000000..0fa79a37
--- /dev/null
+++ b/include/linux/spinlock.h
@@ -0,0 +1,60 @@
+#ifndef __TOOLS_LINUX_SPINLOCK_H
+#define __TOOLS_LINUX_SPINLOCK_H
+
+#include <linux/atomic.h>
+
+typedef struct {
+	int		count;
+} raw_spinlock_t;
+
+#define __RAW_SPIN_LOCK_UNLOCKED(name)	(raw_spinlock_t) { .count = 0 }
+
+static inline void raw_spin_lock_init(raw_spinlock_t *lock)
+{
+	smp_store_release(&lock->count, 0);
+}
+
+static inline void raw_spin_lock(raw_spinlock_t *lock)
+{
+	while (xchg_acquire(&lock->count, 1))
+		;
+}
+
+static inline void raw_spin_unlock(raw_spinlock_t *lock)
+{
+	smp_store_release(&lock->count, 0);
+}
+
+#define raw_spin_lock_irq(lock)		raw_spin_lock(lock)
+#define raw_spin_unlock_irq(lock)	raw_spin_unlock(lock)
+
+#define raw_spin_lock_irqsave(lock, flags)		\
+do {							\
+	(void) flags;					\
+	raw_spin_lock(lock);				\
+} while (0)
+
+#define raw_spin_unlock_irqrestore(lock, flags) raw_spin_unlock(lock)
+
+typedef raw_spinlock_t spinlock_t;
+
+#define __SPIN_LOCK_UNLOCKED(name)	__RAW_SPIN_LOCK_UNLOCKED(name)
+
+#define DEFINE_SPINLOCK(x)	spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
+
+#define spin_lock_init(lock)		raw_spin_lock_init(lock)
+#define spin_lock(lock)			raw_spin_lock(lock)
+#define spin_unlock(lock)		raw_spin_unlock(lock)
+
+#define spin_lock_nested(lock, n)	spin_lock(lock)
+
+#define spin_lock_bh(lock)		raw_spin_lock(lock)
+#define spin_unlock_bh(lock)		raw_spin_unlock(lock)
+
+#define spin_lock_irq(lock)		raw_spin_lock(lock)
+#define spin_unlock_irq(lock)		raw_spin_unlock(lock)
+
+#define spin_lock_irqsave(lock, flags)	raw_spin_lock_irqsave(lock, flags)
+#define spin_unlock_irqrestore(lock, flags) raw_spin_unlock_irqrestore(lock, flags)
+
+#endif /* __TOOLS_LINUX_SPINLOCK_H */