On Thu, Jun 27, 2024 at 10:54:21AM +1000, Alistair Popple wrote: > +extern void prep_compound_page(struct page *page, unsigned int order); No need for the extern. > static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t *pte, > - unsigned long addr, struct page *page, pgprot_t prot) > + unsigned long addr, struct page *page, pgprot_t prot, bool mkwrite) Overly long line. > + retval = insert_page_into_pte_locked(vma, pte, addr, page, prot, mkwrite); .. same here. > +vm_fault_t dax_insert_pfn(struct vm_area_struct *vma, > + unsigned long addr, pfn_t pfn_t, bool write) This could probably use a kerneldoc comment.