1 files changed, 10 insertions, 6 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 3ad25f9d1fc..6a5b90d0cfd 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -126,9 +126,6 @@ static void register_page_bootmem_info_section(unsigned long start_pfn)
         struct mem_section *ms;
         struct page *page, *memmap;
 
-        if (!pfn_valid(start_pfn))
-                return;
-
         section_nr = pfn_to_section_nr(start_pfn);
         ms = __nr_to_section(section_nr);
 
@@ -187,9 +184,16 @@ void register_page_bootmem_info_node(struct pglist_data *pgdat)
         end_pfn = pfn + pgdat->node_spanned_pages;
 
         /* register_section info */
-        for (; pfn < end_pfn; pfn += PAGES_PER_SECTION)
-                register_page_bootmem_info_section(pfn);
-
+        for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
+                /*
+                 * Some platforms can assign the same pfn to multiple nodes - on
+                 * node0 as well as nodeN.  To avoid registering a pfn against
+                 * multiple nodes we check that this pfn does not already
+                 * reside in some other node.
+                 */
+                if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node))
+                        register_page_bootmem_info_section(pfn);
+        }
 }
 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */