Switch to nanoprintf + good spinlock (rflags) = no more FLANTERM ISSUES???

src/sched/spinlock.h

@@ -0,0 +1,22 @@
+/*
+ * @author  xamidev <xamidev@riseup.net>
+ * @brief   Spinlock implementation
+ * @license GPL-3.0-only
+ */
+
+#ifndef SPINLOCK_H
+#define SPINLOCK_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct spinlock_t
+{
+    bool locked;
+    uint64_t rflags;
+};
+
+void spinlock_acquire(struct spinlock_t* lock);
+void spinlock_release(struct spinlock_t* lock);
+
+#endif