diff --git a/[refs] b/[refs]
index 8aa90808a57a..f4352025f527 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b556b35e98ad2b9174a7a623d152cdf412d1a999
+refs/heads/master: f2ecfab91c6f248cf71dff66c2111d31c8cc1747
diff --git a/trunk/arch/x86_64/kernel/smpboot.c b/trunk/arch/x86_64/kernel/smpboot.c
index 043b1d262a30..f513dacc177f 100644
--- a/trunk/arch/x86_64/kernel/smpboot.c
+++ b/trunk/arch/x86_64/kernel/smpboot.c
@@ -646,6 +646,7 @@ static int __cpuinit wakeup_secondary_via_INIT(int phys_apicid, unsigned int sta
 		send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
 	} while (send_status && (timeout++ < 1000));
 
+	mb();
 	atomic_set(&init_deasserted, 1);
 
 	num_starts = 2;