x86: keep MP_intsrc_info untouched if we do not update mptable
Daniel Exner reported IO-APIC enumeration breakage in linux-next.
Alexey Starikovskiy found out that it might be related to
commit 2944e16b25 "x86: update mptable".
use enable_update_mptable to decide if need check before add mp_irqs array.
Reported-by: Daniel Exner <webmaster@dragonslave.de>
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index caf4ed7..4d370b1 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1172,6 +1172,9 @@
struct mpc_config_intsrc intsrc;
int ioapic;
+ if (!enable_update_mptable)
+ return 0;
+
/* print the entry should happen on mptable identically */
intsrc.mpc_type = MP_INTSRC;
intsrc.mpc_irqtype = mp_INT;