[PATCH] for_each_online_pgdat: remove sorting pgdat

Because pgdat_list was linked to pgdat_list in *reverse* order, (By default)
some of arch has to sort it by themselves.

for_each_pgdat has gone..for_each_online_pgdat() uses node_online_map, which
doesn't need to be sorted.

This patch removes codes for sorting pgdat.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ia64/mm/discontig.c

@@ -378,31 +378,6 @@ static void __init *memory_less_node_alloc(int nid, unsigned long pernodesize)
 	return ptr;
 }
 
-/**
- * pgdat_insert - insert the pgdat into global pgdat_list
- * @pgdat: the pgdat for a node.
- */
-static void __init pgdat_insert(pg_data_t *pgdat)
-{
-	pg_data_t *prev = NULL, *next;
-
-	for_each_online_pgdat(next)
-		if (pgdat->node_id < next->node_id)
-			break;
-		else
-			prev = next;
-
-	if (prev) {
-		prev->pgdat_next = pgdat;
-		pgdat->pgdat_next = next;
-	} else {
-		pgdat->pgdat_next = pgdat_list;
-		pgdat_list = pgdat;
-	}
-
-	return;
-}
-
 /**
  * memory_less_nodes - allocate and initialize CPU only nodes pernode
  *	information.
@@ -745,11 +720,5 @@ void __init paging_init(void)
 				    pfn_offset, zholes_size);
 	}
 
-	/*
-	 * Make memory less nodes become a member of the known nodes.
-	 */
-	for_each_node_mask(node, memory_less_mask)
-		pgdat_insert(mem_data[node].pgdat);
-
 	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
 }