mm/page_alloc: integrate classzone_idx and high_zoneidx

classzone_idx is just different name for high_zoneidx now.  So, integrate
them and add some comment to struct alloc_context in order to reduce
future confusion about the meaning of this variable.

The accessor, ac_classzone_idx() is also removed since it isn't needed
after integration.

In addition to integration, this patch also renames high_zoneidx to
highest_zoneidx since it represents more precise meaning.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ye Xiaolong <xiaolong.ye@intel.com>
Link: http://lkml.kernel.org/r/1587095923-7515-3-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e67dc50..926ec70 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -879,13 +879,13 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
 	} else {
 		int cpu;
 		/*
-		 * Reset the nr_zones, order and classzone_idx before reuse.
-		 * Note that kswapd will init kswapd_classzone_idx properly
+		 * Reset the nr_zones, order and highest_zoneidx before reuse.
+		 * Note that kswapd will init kswapd_highest_zoneidx properly
 		 * when it starts in the near future.
 		 */
 		pgdat->nr_zones = 0;
 		pgdat->kswapd_order = 0;
-		pgdat->kswapd_classzone_idx = 0;
+		pgdat->kswapd_highest_zoneidx = 0;
 		for_each_online_cpu(cpu) {
 			struct per_cpu_nodestat *p;