diff --git a/kernel/resource.c b/kernel/resource.c
index 2cf0edd8223f2f2136b47e448b295baad6c07b15..55a3c60106827cff7205507c14065491d93d846b 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -448,6 +448,9 @@ int walk_mem_res(u64 start, u64 end, void *arg,
  * This function calls the @func callback against all memory ranges of type
  * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY.
  * It is to be used only for System RAM.
+ *
+ * This will find System RAM ranges that are children of top-level resources
+ * in addition to top-level System RAM resources.
  */
 int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 		void *arg, int (*func)(unsigned long, unsigned long, void *))
@@ -463,7 +466,7 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
 	flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 	while (start < end &&
 	       !find_next_iomem_res(start, end, flags, IORES_DESC_NONE,
-				    true, &res)) {
+				    false, &res)) {
 		pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT;
 		end_pfn = (res.end + 1) >> PAGE_SHIFT;
 		if (end_pfn > pfn)