PM/Hibernate: Fix memory shrinking

Commit d979677c4c0 ("mm: shrink_all_memory(): use sc.nr_reclaimed")
broke the memory shrinking used by hibernation, becuse it did not update
shrink_all_zones() in accordance with the other changes it made.

Fix this by making shrink_all_zones() update sc->nr_reclaimed instead of
overwriting its value.

This fixes http://bugzilla.kernel.org/show_bug.cgi?id=13058

Reported-and-tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 39fdfb14eeaa..99155b7b8123 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2088,13 +2088,13 @@ static void shrink_all_zones(unsigned long nr_pages, int prio,
                                 nr_reclaimed += shrink_list(l, nr_to_scan, zone,
                                                                 sc, prio);
                                 if (nr_reclaimed >= nr_pages) {
-                                        sc->nr_reclaimed = nr_reclaimed;
+                                        sc->nr_reclaimed += nr_reclaimed;
                                         return;
                                 }
                         }
                 }
         }
-        sc->nr_reclaimed = nr_reclaimed;
+        sc->nr_reclaimed += nr_reclaimed;
 }
 
 /*
@@ -2115,6 +2115,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
                 .may_unmap = 0,
                 .may_writepage = 1,
                 .isolate_pages = isolate_pages_global,
+                .nr_reclaimed = 0,
         };
 
         current->reclaim_state = &reclaim_state;