1 files changed, 6 insertions, 0 deletions

diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
index 30d8d33491dd..52226e14bd7d 100644
--- a/include/asm-generic/memory_model.h
+++ b/include/asm-generic/memory_model.h
@@ -46,6 +46,12 @@
          __pgdat->node_start_pfn;                                       \
 })
 
+#elif defined(CONFIG_SPARSEMEM_VMEMMAP)
+
+/* memmap is virtually contigious.  */
+#define __pfn_to_page(pfn)      (vmemmap + (pfn))
+#define __page_to_pfn(page)     ((page) - vmemmap)
+
 #elif defined(CONFIG_SPARSEMEM)
 /*
  * Note: section's mem_map is encorded to reflect its start_pfn.