[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>

3 files changed, 0 insertions, 48 deletions

diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index c4af9638dbfa..c3f3ae95e22d 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -352,17 +352,6 @@ void __init zone_sizes_init(void)
 {
         int nid;
 
-        /*
-         * Insert nodes into pgdat_list backward so they appear in order.
-         * Clobber node 0's links and NULL out pgdat_list before starting.
-         */
-        pgdat_list = NULL;
-        for (nid = MAX_NUMNODES - 1; nid >= 0; nid--) {
-                if (!node_online(nid))
-                        continue;
-                NODE_DATA(nid)->pgdat_next = pgdat_list;
-                pgdat_list = NODE_DATA(nid);
-        }
 
         for_each_online_node(nid) {
                 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 384f1d7dce96..ec9eeb89975d 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -379,31 +379,6 @@ static void __init *memory_less_node_alloc(int nid, unsigned long pernodesize)
 }
 
 /**
- * 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));
 }
diff --git a/arch/m32r/mm/discontig.c b/arch/m32r/mm/discontig.c
index 08e727955555..70c8528a0ad5 100644
--- a/arch/m32r/mm/discontig.c
+++ b/arch/m32r/mm/discontig.c
@@ -137,12 +137,6 @@ unsigned long __init zone_sizes_init(void)
         int nid, i;
         mem_prof_t *mp;
 
-        pgdat_list = NULL;
-        for (nid = num_online_nodes() - 1 ; nid >= 0 ; nid--) {
-                NODE_DATA(nid)->pgdat_next = pgdat_list;
-                pgdat_list = NODE_DATA(nid);
-        }
-
         for_each_online_node(nid) {
                 mp = &mem_prof[nid];
                 for (i = 0 ; i < MAX_NR_ZONES ; i++) {