s390/mm: fix addressing exception after suspend/resume

commit 37a366face294facb9c9d9fdd9f5b64a27456cbd upstream.

Commit c9b5ad546e7d "s390/mm: tag normal pages vs pages used in page tables"
accidentally changed the logic in arch_set_page_states(), which is used by
the suspend/resume code. set_page_stable(page, order) was changed to
set_page_stable_dat(page, 0). After this, only the first page of higher order
pages will be set to stable, and a write to one of the unstable pages will
result in an addressing exception.

Fix this by using "order" again, instead of "0".

Fixes: c9b5ad546e7d ("s390/mm: tag normal pages vs pages used in page tables")
Cc: stable@vger.kernel.org # 4.14+
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c
index 382153ff17e30e5203b217654d6b25fa0ddd78e6..dc3cede7f2ec9df1a886fc3e92821f2b7f9c6195 100644 (file)
--- a/arch/s390/mm/page-states.c
+++ b/arch/s390/mm/page-states.c
@@ -271,7 +271,7 @@ void arch_set_page_states(int make_stable)
                        list_for_each(l, &zone->free_area[order].free_list[t]) {
                                page = list_entry(l, struct page, lru);
                                if (make_stable)
-                                       set_page_stable_dat(page, 0);
+                                       set_page_stable_dat(page, order);
                                else
                                        set_page_unused(page, order);
                        }