On Mon, 29 Jan 2018 17:06:14 -0500 "Zi Yan" <[email protected]> wrote:
> I discover that this patch does not hold mmap_sem while migrating pages in > do_move_pages_to_node(). > > A simple fix below moves mmap_sem from add_page_for_migration() > to the outmost do_pages_move(): I'm not surprised. Why does do_move_pages_to_node() need mmap_sem and how is a reader to discover that fact???
