mm/page_alloc: remove unused parameter in init_currently_empty_zone()

Commit a2f3aa025766 ("[PATCH] Fix sparsemem on Cell") fixed an oops
experienced on the Cell architecture when init-time functions,
early_*(), are called at runtime by introducing an 'enum memmap_context'
parameter to memmap_init_zone() and init_currently_empty_zone().  This
parameter is intended to be used to tell whether the call of these two
functions is being made on behalf of a hotplug event, or happening at
boot-time.  However, init_currently_empty_zone() does not use this
parameter at all, so remove it.

Signed-off-by: Yaowei Bai <bywxiaobai@163.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mmzone.h

@@ -823,8 +823,7 @@ enum memmap_context {
 	MEMMAP_HOTPLUG,
 };
 extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
-				     unsigned long size,
-				     enum memmap_context context);
+				     unsigned long size);
 
 extern void lruvec_init(struct lruvec *lruvec);
 

mm/memory_hotplug.c

@@ -339,8 +339,8 @@ static int __ref ensure_zone_is_initialized(struct zone *zone,
 			unsigned long start_pfn, unsigned long num_pages)
 {
 	if (!zone_is_initialized(zone))
-		return init_currently_empty_zone(zone, start_pfn, num_pages,
-						 MEMMAP_HOTPLUG);
+		return init_currently_empty_zone(zone, start_pfn, num_pages);
+
 	return 0;
 }
 

mm/page_alloc.c

@@ -4900,8 +4900,7 @@ static __meminit void zone_pcp_init(struct zone *zone)
 
 int __meminit init_currently_empty_zone(struct zone *zone,
 					unsigned long zone_start_pfn,
-					unsigned long size,
-					enum memmap_context context)
+					unsigned long size)
 {
 	struct pglist_data *pgdat = zone->zone_pgdat;
 	int ret;
@@ -5413,8 +5412,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 
 		set_pageblock_order();
 		setup_usemap(pgdat, zone, zone_start_pfn, size);
-		ret = init_currently_empty_zone(zone, zone_start_pfn,
-						size, MEMMAP_EARLY);
+		ret = init_currently_empty_zone(zone, zone_start_pfn, size);
 		BUG_ON(ret);
 		memmap_init(size, nid, j, zone_start_pfn);
 		zone_start_pfn += size;