1 files changed, 18 insertions, 0 deletions

diff --git a/mm/memblock.c b/mm/memblock.c
index a847bfe6f3ba..0ac412a0a7ee 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -914,6 +914,24 @@ int __init_memblock memblock_is_memory(phys_addr_t addr)
         return memblock_search(&memblock.memory, addr) != -1;
 }
 
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
+                         unsigned long *start_pfn, unsigned long *end_pfn)
+{
+        struct memblock_type *type = &memblock.memory;
+        int mid = memblock_search(type, (phys_addr_t)pfn << PAGE_SHIFT);
+
+        if (mid == -1)
+                return -1;
+
+        *start_pfn = type->regions[mid].base >> PAGE_SHIFT;
+        *end_pfn = (type->regions[mid].base + type->regions[mid].size)
+                        >> PAGE_SHIFT;
+
+        return type->regions[mid].nid;
+}
+#endif
+
 /**
  * memblock_is_region_memory - check if a region is a subset of memory
  * @base: base of region to check