mm: remove redundant initialization

pg_data_t is zeroed before reaching free_area_init_core(), so remove the
now unnecessary initializations.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 7 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a6f7576aecae..889532b8e6c1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4377,6 +4377,8 @@ void __init set_pageblock_order(void)
  *   - mark all pages reserved
  *   - mark all memory queues empty
  *   - clear the memory bitmaps
+ *
+ * NOTE: pgdat should get zeroed by caller.
  */
 static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                 unsigned long *zones_size, unsigned long *zholes_size)
@@ -4387,10 +4389,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
         int ret;
 
         pgdat_resize_init(pgdat);
-        pgdat->nr_zones = 0;
         init_waitqueue_head(&pgdat->kswapd_wait);
         init_waitqueue_head(&pgdat->pfmemalloc_wait);
-        pgdat->kswapd_max_order = 0;
         pgdat_page_cgroup_init(pgdat);
 
         for (j = 0; j < MAX_NR_ZONES; j++) {
@@ -4451,11 +4451,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
 
                 zone_pcp_init(zone);
                 lruvec_init(&zone->lruvec, zone);
-                zap_zone_vm_stats(zone);
-                zone->flags = 0;
-#ifdef CONFIG_MEMORY_ISOLATION
-                zone->nr_pageblock_isolate = 0;
-#endif
                 if (!size)
                         continue;