#define page_tree i_pages
#else
#define i_pages tree_lock
+#define xa_lock_irqsave(lockp, flags) spin_lock_irqsave(lockp, flags)
+#define xa_unlock_irqrestore(lockp, flags) spin_unlock_irqrestore(lockp, flags)
#define xa_lock_irq(lockp) spin_lock_irq(lockp)
#define xa_unlock_irq(lockp) spin_unlock_irq(lockp)
#endif