1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/setup64.c b/arch/x86_64/kernel/setup64.c
index e85cfbb49b63..491361752c70 100644
--- a/arch/x86_64/kernel/setup64.c
+++ b/arch/x86_64/kernel/setup64.c
@@ -121,7 +121,10 @@ void pda_init(int cpu)
 
         /* Setup up data that may be needed in __get_free_pages early */
         asm volatile("movl %0,%%fs ; movl %0,%%gs" :: "r" (0)); 
+        /* Memory clobbers used to order PDA accessed */
+        mb();
         wrmsrl(MSR_GS_BASE, pda);
+        mb();
 
         pda->cpunumber = cpu; 
         pda->irqcount = -1;