1 files changed, 24 insertions, 12 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c8e0db464206..d02a0ca70ee9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -96,6 +96,7 @@ struct exec_domain;
 struct futex_pi_state;
 struct robust_list_head;
 struct bio;
+struct bts_tracer;
 
 /*
  * List of flags we want to share for kernel threads,
@@ -1161,6 +1162,18 @@ struct task_struct {
         struct list_head ptraced;
         struct list_head ptrace_entry;
 
+#ifdef CONFIG_X86_PTRACE_BTS
+        /*
+         * This is the tracer handle for the ptrace BTS extension.
+         * This field actually belongs to the ptracer task.
+         */
+        struct bts_tracer *bts;
+        /*
+         * The buffer to hold the BTS data.
+         */
+        void *bts_buffer;
+#endif /* CONFIG_X86_PTRACE_BTS */
+
         /* PID/PID hash table linkage. */
         struct pid_link pids[PIDTYPE_MAX];
         struct list_head thread_group;
@@ -1352,6 +1365,17 @@ struct task_struct {
         unsigned long default_timer_slack_ns;
 
         struct list_head        *scm_work_list;
+#ifdef CONFIG_FUNCTION_RET_TRACER
+        /* Index of current stored adress in ret_stack */
+        int curr_ret_stack;
+        /* Stack of return addresses for return function tracing */
+        struct ftrace_ret_stack *ret_stack;
+        /*
+         * Number of functions that haven't been traced
+         * because of depth overrun.
+         */
+        atomic_t trace_overrun;
+#endif
 };
 
 /*
@@ -2006,18 +2030,6 @@ static inline void setup_thread_stack(struct task_struct *p, struct task_struct
 {
         *task_thread_info(p) = *task_thread_info(org);
         task_thread_info(p)->task = p;
-
-#ifdef CONFIG_FUNCTION_RET_TRACER
-        /*
-         * When fork() creates a child process, this function is called.
-         * But the child task may not inherit the return adresses traced
-         * by the return function tracer because it will directly execute
-         * in userspace and will not return to kernel functions its parent
-         * used.
-         */
-        task_thread_info(p)->curr_ret_stack = -1;
-        atomic_set(&task_thread_info(p)->trace_overrun, 0);
-#endif
 }
 
 static inline unsigned long *end_of_stack(struct task_struct *p)