};
#define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
+bool is_vma_temporary_stack(struct vm_area_struct *vma);
+
int try_to_unmap(struct page *, enum ttu_flags flags);
int try_to_unmap_one(struct page *, struct vm_area_struct *,
unsigned long address, enum ttu_flags flags);