Merge branches 'tracing/ftrace' and 'tracing/function-graph-tracer' into tracing/core

1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d89ab46c6e..2e78628443e 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);