[PATCH] for_each_online_pgdat: remove pgdat_list

By using for_each_online_pgdat(), pgdat_list is not necessary now.  This patch
removes it.

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>

2 files changed, 4 insertions, 7 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 96eb08025092..0d12c3cf1f86 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -307,7 +307,6 @@ typedef struct pglist_data {
         unsigned long node_spanned_pages; /* total size of physical page
                                              range, including holes */
         int node_id;
-        struct pglist_data *pgdat_next;
         wait_queue_head_t kswapd_wait;
         struct task_struct *kswapd;
         int kswapd_max_order;
@@ -324,8 +323,6 @@ typedef struct pglist_data {
 
 #include <linux/memory_hotplug.h>
 
-extern struct pglist_data *pgdat_list;
-
 void __get_zone_counts(unsigned long *active, unsigned long *inactive,
                         unsigned long *free, struct pglist_data *pgdat);
 void get_zone_counts(unsigned long *active, unsigned long *inactive,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ccc3713dd407..dc523a1f270d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -49,7 +49,6 @@ nodemask_t node_online_map __read_mostly = { { [0] = 1UL } };
 EXPORT_SYMBOL(node_online_map);
 nodemask_t node_possible_map __read_mostly = NODE_MASK_ALL;
 EXPORT_SYMBOL(node_possible_map);
-struct pglist_data *pgdat_list __read_mostly;
 unsigned long totalram_pages __read_mostly;
 unsigned long totalhigh_pages __read_mostly;
 long nr_swap_pages;
@@ -2169,8 +2168,9 @@ static void *frag_start(struct seq_file *m, loff_t *pos)
 {
         pg_data_t *pgdat;
         loff_t node = *pos;
-
-        for (pgdat = pgdat_list; pgdat && node; pgdat = pgdat->pgdat_next)
+        for (pgdat = first_online_pgdat();
+             pgdat && node;
+             pgdat = next_online_pgdat(pgdat))
                 --node;
 
         return pgdat;
@@ -2181,7 +2181,7 @@ static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
         pg_data_t *pgdat = (pg_data_t *)arg;
 
         (*pos)++;
-        return pgdat->pgdat_next;
+        return next_online_pgdat(pgdat);
 }
 
 static void frag_stop(struct seq_file *m, void *arg)