diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index d1dd5160daa9095239adadeee1140c701a819e8e..2b6c5902825437470d50e7e841a23d3c37b10d61 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -272,7 +272,7 @@ acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
 }
 EXPORT_SYMBOL_GPL(acpi_os_map_memory);
 
-void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
+void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 {
 	if (acpi_gbl_permanent_mmap)
 		iounmap(virt);
@@ -281,7 +281,7 @@ void acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
 }
 EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
 
-void early_acpi_os_unmap_memory(void __iomem * virt, acpi_size size)
+void __init early_acpi_os_unmap_memory(void __iomem *virt, acpi_size size)
 {
 	if (!acpi_gbl_permanent_mmap)
 		__acpi_unmap_table(virt, size);