diff --git a/[refs] b/[refs]
index f27a936c0557..07d4f518d9a9 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b276268631af3a1b0df871e10d19d492f0513d4b
+refs/heads/master: f9695df42cdbca78530b4458c38ecfdd0bb90079
diff --git a/trunk/arch/x86/kernel/cpu/mcheck/threshold.c b/trunk/arch/x86/kernel/cpu/mcheck/threshold.c
index 4319142413d7..e4b8a3833fc5 100644
--- a/trunk/arch/x86/kernel/cpu/mcheck/threshold.c
+++ b/trunk/arch/x86/kernel/cpu/mcheck/threshold.c
@@ -15,10 +15,11 @@ void (*mce_threshold_vector)(void) = default_threshold_interrupt;
 
 asmlinkage void mce_threshold_interrupt(void)
 {
-	ack_APIC_irq();
 	exit_idle();
 	irq_enter();
 	inc_irq_stat(irq_threshold_count);
 	mce_threshold_vector();
 	irq_exit();
+	/* Ack only at the end to avoid potential reentry */
+	ack_APIC_irq();
 }