On 08/12, Kirill A. Shutemov wrote: > > On Fri, Aug 09, 2019 at 06:01:18PM +0000, Song Liu wrote: > > + if (pte_none(*pte) || !pte_present(*pte)) > > + continue; > > You don't need to check both. Present is never none. Agreed. Kirill, while you are here, shouldn't retract_page_tables() check vma->anon_vma (and probably do mm_find_pmd) under vm_mm->mmap_sem? Can't it race with, say, do_cow_fault? Oleg.
