diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 0874799..ae30b39 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -242,19 +242,18 @@ static int __init find_unisys_acpi_oem_table(unsigned long *oem_addr)
 {
 	struct acpi_table_header *header = NULL;
 	struct es7000_oem_table *table;
-	acpi_size tbl_size;
 	acpi_status ret;
 	int i = 0;
 
 	for (;;) {
-		ret = acpi_get_table_with_size("OEM1", i++, &header, &tbl_size);
+		ret = acpi_get_table("OEM1", i++, &header);
 		if (!ACPI_SUCCESS(ret))
 			return -1;
 
 		if (!memcmp((char *) &header->oem_id, "UNISYS", 6))
 			break;
 
-		early_acpi_os_unmap_memory(header, tbl_size);
+		early_acpi_os_unmap_memory(header, header->length);
 	}
 
 	table = (void *)header;
@@ -262,7 +261,7 @@ static int __init find_unisys_acpi_oem_table(unsigned long *oem_addr)
 	oem_addrX	= table->OEMTableAddr;
 	oem_size	= table->OEMTableSize;
 
-	early_acpi_os_unmap_memory(header, tbl_size);
+	early_acpi_os_unmap_memory(header, header->length);
 
 	*oem_addr	= (unsigned long)__acpi_map_table(oem_addrX, oem_size);
 
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index f336bca..5b8b7e0 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -211,7 +211,6 @@ acpi_table_parse_entries(char *id,
 	struct acpi_subtable_header *entry;
 	unsigned int count = 0;
 	unsigned long table_end;
-	acpi_size tbl_size;
 
 	if (acpi_disabled)
 		return -ENODEV;
@@ -220,9 +219,9 @@ acpi_table_parse_entries(char *id,
 		return -EINVAL;
 
 	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
-		acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
+		acpi_get_table(id, acpi_apic_instance, &table_header);
 	else
-		acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
+		acpi_get_table(id, 0, &table_header);
 
 	if (!table_header) {
 		printk(KERN_WARNING PREFIX "%4.4s not present\n", id);
@@ -241,7 +240,7 @@ acpi_table_parse_entries(char *id,
 		if (entry->type == entry_id
 		    && (!max_entries || count++ < max_entries))
 			if (handler(entry, table_end)) {
-				early_acpi_os_unmap_memory((char *)table_header, tbl_size);
+				early_acpi_os_unmap_memory((char *)table_header, table_header->length);
 				return -EINVAL;
 			}
 
@@ -253,7 +252,7 @@ acpi_table_parse_entries(char *id,
 		       "%i found\n", id, entry_id, count - max_entries, count);
 	}
 
-	early_acpi_os_unmap_memory((char *)table_header, tbl_size);
+	early_acpi_os_unmap_memory((char *)table_header, table_header->length);
 	return count;
 }
 
@@ -278,7 +277,6 @@ acpi_table_parse_madt(enum acpi_madt_type id,
 int __init acpi_table_parse(char *id, acpi_table_handler handler)
 {
 	struct acpi_table_header *table = NULL;
-	acpi_size tbl_size;
 
 	if (acpi_disabled)
 		return -ENODEV;
@@ -287,13 +285,13 @@ int __init acpi_table_parse(char *id, acpi_table_handler handler)
 		return -EINVAL;
 
 	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
-		acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
+		acpi_get_table(id, acpi_apic_instance, &table);
 	else
-		acpi_get_table_with_size(id, 0, &table, &tbl_size);
+		acpi_get_table(id, 0, &table);
 
 	if (table) {
 		handler(table);
-		early_acpi_os_unmap_memory(table, tbl_size);
+		early_acpi_os_unmap_memory(table, table->length);
 		return 0;
 	} else
 		return 1;
@@ -307,9 +305,8 @@ int __init acpi_table_parse(char *id, acpi_table_handler handler)
 static void __init check_multiple_madt(void)
 {
 	struct acpi_table_header *table = NULL;
-	acpi_size tbl_size;
 
-	acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
+	acpi_get_table(ACPI_SIG_MADT, 2, &table);
 	if (table) {
 		printk(KERN_WARNING PREFIX
 		       "BIOS bug: multiple APIC/MADT found,"
@@ -318,7 +315,7 @@ static void __init check_multiple_madt(void)
 		       "If \"acpi_apic_instance=%d\" works better, "
 		       "notify linux-acpi@vger.kernel.org\n",
 		       acpi_apic_instance ? 0 : 2);
-		early_acpi_os_unmap_memory(table, tbl_size);
+		early_acpi_os_unmap_memory(table, table->length);
 
 	} else
 		acpi_apic_instance = 0;
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 500e7f1..6b19f42 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1525,14 +1525,13 @@ static void __init free_on_init_error(void)
 static int __init early_amd_iommu_init(void)
 {
 	struct acpi_table_header *ivrs_base;
-	acpi_size ivrs_size;
 	acpi_status status;
 	int i, ret = 0;
 
 	if (!amd_iommu_detected)
 		return -ENODEV;
 
-	status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
+	status = acpi_get_table("IVRS", 0, &ivrs_base);
 	if (status == AE_NOT_FOUND)
 		return -ENODEV;
 	else if (ACPI_FAILURE(status)) {
@@ -1614,7 +1613,7 @@ static int __init early_amd_iommu_init(void)
 
 out:
 	/* Don't leak any ACPI memory */
-	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
+	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_base->length);
 	ivrs_base = NULL;
 
 	return ret;
@@ -1638,10 +1637,9 @@ out:
 static bool detect_ivrs(void)
 {
 	struct acpi_table_header *ivrs_base;
-	acpi_size ivrs_size;
 	acpi_status status;
 
-	status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
+	status = acpi_get_table("IVRS", 0, &ivrs_base);
 	if (status == AE_NOT_FOUND)
 		return false;
 	else if (ACPI_FAILURE(status)) {
@@ -1650,7 +1648,7 @@ static bool detect_ivrs(void)
 		return false;
 	}
 
-	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
+	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_base->length);
 
 	return true;
 }
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 86e2f4a..aa65b6f 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -48,7 +48,6 @@
 LIST_HEAD(dmar_drhd_units);
 
 struct acpi_table_header * __initdata dmar_tbl;
-static acpi_size dmar_tbl_size;
 
 static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
 {
@@ -285,10 +284,8 @@ static int __init dmar_table_detect(void)
 	acpi_status status = AE_OK;
 
 	/* if we could find DMAR table, then there are DMAR devices */
-	status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0,
-				(struct acpi_table_header **)&dmar_tbl,
-				&dmar_tbl_size);
-
+	status = acpi_get_table(ACPI_SIG_DMAR, 0,
+				(struct acpi_table_header **)&dmar_tbl);
 	if (ACPI_SUCCESS(status) && !dmar_tbl) {
 		pr_warn("Unable to map DMAR\n");
 		status = AE_NOT_FOUND;
@@ -558,8 +555,11 @@ int __init detect_intel_iommu(void)
 			x86_init.iommu.iommu_init = intel_iommu_init;
 #endif
 	}
-	early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size);
-	dmar_tbl = NULL;
+
+	if (dmar_tbl) {
+		early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl->length);
+		dmar_tbl = NULL;
+	}
 
 	return ret ? 1 : -ENODEV;
 }
