diff --git a/arch/i386/kernel/dmi_scan.c b/arch/i386/kernel/dmi_scan.c
index 170d4c9..5efceeb 100644
--- a/arch/i386/kernel/dmi_scan.c
+++ b/arch/i386/kernel/dmi_scan.c
@@ -229,7 +229,7 @@
 			goto out;
 
 		rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
-		iounmap(p);
+		dmi_iounmap(p, 32);
 		if (!rc)
 			return;
 	}
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index cec3c92..6917daa 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1058,10 +1058,10 @@
 free_available_memory(unsigned long start, unsigned long end, void *arg)
 {
 	/* check max_low_pfn */
-	if (start >= ((max_low_pfn + 1) << PAGE_SHIFT))
+	if (start >= (max_low_pfn << PAGE_SHIFT))
 		return 0;
-	if (end >= ((max_low_pfn + 1) << PAGE_SHIFT))
-		end = (max_low_pfn + 1) << PAGE_SHIFT;
+	if (end >= (max_low_pfn << PAGE_SHIFT))
+		end = max_low_pfn << PAGE_SHIFT;
 	if (start < end)
 		free_bootmem(start, end - start);
 
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 31d4f3f..7f37c7c 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -587,7 +587,8 @@
 		return -ENODEV;
 	}
 
-	rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
+	rsdp = (struct acpi_table_rsdp *)__acpi_map_table(rsdp_phys,
+		sizeof(struct acpi_table_rsdp));
 	if (!rsdp) {
 		printk(KERN_WARNING PREFIX "Unable to map RSDP\n");
 		return -ENODEV;