FOLL_WRITE
start, nr_pages, !!(gup_flags & FOLL_WRITE), pages);
!!(gup_flags & FOLL_WRITE), pages));
!!(gup_flags & FOLL_WRITE), pages));
ret = get_user_pages(uaddr & PAGE_MASK, 1, FOLL_WRITE, pages, NULL);
unsigned int gup_flags = FOLL_WRITE;
flags |= FOLL_WRITE;