mm: use zonelist name instead of using hardcoded index

Use the existing enums instead of hardcoded index when looking at the
zonelist.  This makes it more readable.  No functionality change by this
patch.

Link: http://lkml.kernel.org/r/1472227078-24852-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 6 insertions, 6 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 2da72a5b6ecc..ad1c96ac313c 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1749,7 +1749,7 @@ unsigned int mempolicy_slab_node(void)
                  */
                 struct zonelist *zonelist;
                 enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL);
-                zonelist = &NODE_DATA(node)->node_zonelists[0];
+                zonelist = &NODE_DATA(node)->node_zonelists[ZONELIST_FALLBACK];
                 z = first_zones_zonelist(zonelist, highest_zoneidx,
                                                         &policy->v.nodes);
                 return z->zone ? z->zone->node : node;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b0f133f2c655..f6a5a221496a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4574,7 +4574,7 @@ static void build_zonelists_in_node_order(pg_data_t *pgdat, int node)
         int j;
         struct zonelist *zonelist;
 
-        zonelist = &pgdat->node_zonelists[0];
+        zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK];
         for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++)
                 ;
         j = build_zonelists_node(NODE_DATA(node), zonelist, j);
@@ -4590,7 +4590,7 @@ static void build_thisnode_zonelists(pg_data_t *pgdat)
         int j;
         struct zonelist *zonelist;
 
-        zonelist = &pgdat->node_zonelists[1];
+        zonelist = &pgdat->node_zonelists[ZONELIST_NOFALLBACK];
         j = build_zonelists_node(pgdat, zonelist, 0);
         zonelist->_zonerefs[j].zone = NULL;
         zonelist->_zonerefs[j].zone_idx = 0;
@@ -4611,7 +4611,7 @@ static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes)
         struct zone *z;
         struct zonelist *zonelist;
 
-        zonelist = &pgdat->node_zonelists[0];
+        zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK];
         pos = 0;
         for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) {
                 for (j = 0; j < nr_nodes; j++) {
@@ -4746,7 +4746,7 @@ static void build_zonelists(pg_data_t *pgdat)
 
         local_node = pgdat->node_id;
 
-        zonelist = &pgdat->node_zonelists[0];
+        zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK];
         j = build_zonelists_node(pgdat, zonelist, 0);
 
         /*
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d3715c1b2e36..744f926af442 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3036,7 +3036,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
          */
         nid = mem_cgroup_select_victim_node(memcg);
 
-        zonelist = NODE_DATA(nid)->node_zonelists;
+        zonelist = &NODE_DATA(nid)->node_zonelists[ZONELIST_FALLBACK];
 
         trace_mm_vmscan_memcg_reclaim_begin(0,
                                             sc.may_writepage,