1 files changed, 19 insertions, 0 deletions

diff --git a/include/asm-mips/page.h b/include/asm-mips/page.h
index 4035ec79ecd4..3d262c01521c 100644
--- a/include/asm-mips/page.h
+++ b/include/asm-mips/page.h
@@ -145,6 +145,25 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 #endif
 #endif
 
+#ifdef CONFIG_FLATMEM
+
+#define pfn_valid(pfn)          ((pfn) < max_mapnr)
+
+#elif defined(CONFIG_NEED_MULTIPLE_NODES)
+
+#define pfn_valid(pfn)                                                  \
+({                                                                      \
+        unsigned long __pfn = (pfn);                                    \
+        int __n = pfn_to_nid(__pfn);                                    \
+        ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +         \
+                               NODE_DATA(__n)->node_spanned_pages)      \
+                    : 0);                                               \
+})
+
+#else
+#error Provide a definition of pfn_valid
+#endif
+
 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)