diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index e48fc98..5963e6f 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -930,7 +930,10 @@
 		goto end;
 	}
 	alarm_string[count] = '\0';
-	battery->alarm = simple_strtol(alarm_string, NULL, 0);
+	if (kstrtoint(alarm_string, 0, &battery->alarm)) {
+		result = -EINVAL;
+		goto end;
+	}
 	result = acpi_battery_set_alarm(battery);
       end:
 	if (!result)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3f2bdc8..bad25b0 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -235,7 +235,8 @@
 static unsigned long acpi_rsdp;
 static int __init setup_acpi_rsdp(char *arg)
 {
-	acpi_rsdp = simple_strtoul(arg, NULL, 16);
+	if (kstrtoul(arg, 16, &acpi_rsdp))
+		return -EINVAL;
 	return 0;
 }
 early_param("acpi_rsdp", setup_acpi_rsdp);
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
index 05550ba..6d5a6cd 100644
--- a/drivers/acpi/tables.c
+++ b/drivers/acpi/tables.c
@@ -360,7 +360,8 @@
 	if (!str)
 		return -EINVAL;
 
-	acpi_apic_instance = simple_strtoul(str, NULL, 0);
+	if (kstrtoint(str, 0, &acpi_apic_instance))
+		return -EINVAL;
 
 	pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);