mce: acpi/apei: Add a boot option to disable ff mode for corrected errors

Add a boot option to disable firmware first mode for corrected errors.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/x86/kernel/acpi/boot.c

@@ -66,6 +66,7 @@ EXPORT_SYMBOL(acpi_pci_disabled);
 int acpi_lapic;
 int acpi_ioapic;
 int acpi_strict;
+int acpi_disable_cmcff;
 
 u8 acpi_sci_flags __initdata;
 int acpi_sci_override_gsi __initdata;
@@ -1619,6 +1620,10 @@ static int __init parse_acpi(char *arg)
 	/* "acpi=copy_dsdt" copys DSDT */
 	else if (strcmp(arg, "copy_dsdt") == 0) {
 		acpi_gbl_copy_dsdt_locally = 1;
+	}
+	/* "acpi=nocmcff" disables FF mode for corrected errors */
+	else if (strcmp(arg, "nocmcff") == 0) {
+		acpi_disable_cmcff = 1;
 	} else {
 		/* Core will printk when we return error. */
 		return -EINVAL;