cma: decrease cc.nr_migratepages after reclaiming pagelist

reclaim_clean_pages_from_list() reclaims clean pages before migration so
cc.nr_migratepages should be updated.  Currently, there is no problem but
it can be wrong if we try to use the value in future.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fd86c47de86f..bb90971182bd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5674,7 +5674,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
                                         unsigned long start, unsigned long end)
 {
         /* This function is based on compact_zone() from compaction.c. */
-
+        unsigned long nr_reclaimed;
         unsigned long pfn = start;
         unsigned int tries = 0;
         int ret = 0;
@@ -5701,7 +5701,9 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
                         break;
                 }
 
-                reclaim_clean_pages_from_list(cc->zone, &cc->migratepages);
+                nr_reclaimed = reclaim_clean_pages_from_list(cc->zone,
+                                                        &cc->migratepages);
+                cc->nr_migratepages -= nr_reclaimed;
 
                 ret = migrate_pages(&cc->migratepages,
                                     alloc_migrate_target,