1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 043b1d262a30..f513dacc177f 100644
--- a/arch/x86_64/kernel/smpboot.c
+++ b/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;