1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d89ab46c6e3..2e78628443e8 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1671,8 +1671,10 @@ static int alloc_retstack_tasklist(struct ftrace_ret_stack **ret_stack_list)
                 }
 
                 if (t->ret_stack == NULL) {
-                        t->ret_stack = ret_stack_list[start++];
                         t->curr_ret_stack = -1;
+                        /* Make sure IRQs see the -1 first: */
+                        barrier();
+                        t->ret_stack = ret_stack_list[start++];
                         atomic_set(&t->trace_overrun, 0);
                 }
         } while_each_thread(g, t);