[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>

1 files changed, 23 insertions, 26 deletions

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 29f3a63806b9..05598649b326 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -44,37 +44,34 @@ 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))
-                        continue;
-                page = pfn_to_page(i);
-                total++;
-                if (PageReserved(page))
-                        reserved++;
-                else if (PageSwapCache(page))
-                        cached++;
-                else if (page_count(page))
-                        shared += page_count(page) - 1;
+        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(pgdat->node_start_pfn + i);
+                        total++;
+                        if (PageReserved(page))
+                                reserved++;
+                        else if (PageSwapCache(page))
+                                cached++;
+                        else if (page_count(page))
+                                shared += page_count(page) - 1;
+                }
+                pgdat_resize_unlock(pgdat, &flags);
         }
-        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));
+        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);
 }
 
 /*