Merge branches 'tracing/ftrace' and 'tracing/urgent' into tracing/core

1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4e6c87ecf1bf..aee95aea57e4 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2562,7 +2562,7 @@ free:
 static int start_graph_tracing(void)
 {
         struct ftrace_ret_stack **ret_stack_list;
-        int ret;
+        int ret, cpu;
 
         ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
                                 sizeof(struct ftrace_ret_stack *),
@@ -2571,6 +2571,10 @@ static int start_graph_tracing(void)
         if (!ret_stack_list)
                 return -ENOMEM;
 
+        /* The cpu_boot init_task->ret_stack will never be freed */
+        for_each_online_cpu(cpu)
+                ftrace_graph_init_task(idle_task(cpu));
+
         do {
                 ret = alloc_retstack_tasklist(ret_stack_list);
         } while (ret == -EAGAIN);