[ARM] Fix show_mem() for discontigmem

show_mem() was assuming incorrectly that the mem_map for any
node started at PFN 0.  This is obviously wrong; fix it to
take account of node_start_pfn.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 4 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index b5814b4b6f35..7760193e74cc 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -52,15 +52,18 @@ void show_mem(void)
         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 
         for_each_online_node(node) {
+                pg_data_t *n = NODE_DATA(node);
+                struct page *map = n->node_mem_map - n->node_start_pfn;
+
                 for_each_nodebank (i,mi,node) {
                         unsigned int pfn1, pfn2;
                         struct page *page, *end;
 
-                        pfn1 = mi->bank[i].start >> PAGE_SHIFT;
-                        pfn2 = (mi->bank[i].size + mi->bank[i].start) >> PAGE_SHIFT;
+                        pfn1 = __phys_to_pfn(mi->bank[i].start);
+                        pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start);
 
-                        page = NODE_MEM_MAP(node) + pfn1;
-                        end  = NODE_MEM_MAP(node) + pfn2;
+                        page = map + pfn1;
+                        end  = map + pfn2;
 
                         do {
                                 total++;