diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index 5420cb0fcb3e..e517088d635f 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -12,7 +12,7 @@
 #ifndef _ASM_ACPI_H
 #define _ASM_ACPI_H
 
-#include <linux/mm.h>
+#include <linux/memblock.h>
 #include <linux/psci.h>
 
 #include <asm/cputype.h>
@@ -32,7 +32,11 @@
 static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
 					    acpi_size size)
 {
-	if (!page_is_ram(phys >> PAGE_SHIFT))
+	/*
+	 * EFI's reserve_regions() call adds memory with the WB attribute
+	 * to memblock via early_init_dt_add_memory_arch().
+	 */
+	if (!memblock_is_memory(phys))
 		return ioremap(phys, size);
 
 	return ioremap_cache(phys, size);
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 536dce22fe76..514b4e3ba029 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -206,10 +206,15 @@ static void __init request_standard_resources(void)
 
 	for_each_memblock(memory, region) {
 		res = alloc_bootmem_low(sizeof(*res));
-		res->name  = "System RAM";
+		if (memblock_is_nomap(region)) {
+			res->name  = "reserved";
+			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+		} else {
+			res->name  = "System RAM";
+			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+		}
 		res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 		res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
-		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
 		request_resource(&iomem_resource, res);