[S390] showmem: Only walk spanned pages.

Convert show_mem() so its nearly the same as on x86/powerpc.
Gives us proper locking and we get also rid of the only use of max_mapnr.
Also the number of pages was contained in an int which might not be
sufficient not too far in the future.

Cc: Johannes Weiner <hannes@saeurebad.de>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/mm/init.c

@@ -44,17 +44,20 @@ char  empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
 
 void show_mem(void)
 {
-	int i, total = 0, reserved = 0;
-	int shared = 0, cached = 0;
+	unsigned long i, total = 0, reserved = 0;
+	unsigned long shared = 0, cached = 0;
+	unsigned long flags;
 	struct page *page;
+	pg_data_t *pgdat;
 
 	printk("Mem-info:\n");
 	show_free_areas();
-	i = max_mapnr;
-	while (i-- > 0) {
-		if (!pfn_valid(i))
+	for_each_online_pgdat(pgdat) {
+		pgdat_resize_lock(pgdat, &flags);
+		for (i = 0; i < pgdat->node_spanned_pages; i++) {
+			if (!pfn_valid(pgdat->node_start_pfn + i))
 				continue;
-		page = pfn_to_page(i);
+			page = pfn_to_page(pgdat->node_start_pfn + i);
 			total++;
 			if (PageReserved(page))
 				reserved++;
@@ -63,18 +66,12 @@ void show_mem(void)
 			else if (page_count(page))
 				shared += page_count(page) - 1;
 		}
-	printk("%d pages of RAM\n", total);
-	printk("%d reserved pages\n", reserved);
-	printk("%d pages shared\n", shared);
-	printk("%d pages swap cached\n", cached);
-
-	printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
-	printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK));
-	printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
-	printk("%lu pages slab\n",
-	       global_page_state(NR_SLAB_RECLAIMABLE) +
-	       global_page_state(NR_SLAB_UNRECLAIMABLE));
-	printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
+		pgdat_resize_unlock(pgdat, &flags);
+	}
+	printk("%ld pages of RAM\n", total);
+	printk("%ld reserved pages\n", reserved);
+	printk("%ld pages shared\n", shared);
+	printk("%ld pages swap cached\n", cached);
 }
 
 /*