tests/kvm-unit-tests/lib/asm-generic/spinlock.h

#ifndef _ASM_GENERIC_SPINLOCK_H_
#define _ASM_GENERIC_SPINLOCK_H_

struct spinlock {
    unsigned int v;
};

static inline void spin_lock(struct spinlock *lock)
{
	while (__sync_lock_test_and_set(&lock->v, 1));
}

static inline void spin_unlock(struct spinlock *lock)
{
	__sync_lock_release(&lock->v);
}

#endif