Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Fix the arm64 usage of ftrace_graph_ret_addr() to pass the
  &state->graph_idx pointer instead of NULL, otherwise this function
  just returns early"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: stacktrace: fix the usage of ftrace_graph_ret_addr()

Author: torvalds

arch/arm64/kernel/stacktrace.c

@@ -25,13 +25,15 @@
  *
  * @common:      Common unwind state.
  * @task:        The task being unwound.
+ * @graph_idx:   Used by ftrace_graph_ret_addr() for optimized stack unwinding.
  * @kr_cur:      When KRETPROBES is selected, holds the kretprobe instance
  *               associated with the most recently encountered replacement lr
  *               value.
  */
 struct kunwind_state {
 	struct unwind_state common;
 	struct task_struct *task;
+	int graph_idx;
 #ifdef CONFIG_KRETPROBES
 	struct llist_node *kr_cur;
 #endif
@@ -106,7 +108,7 @@ kunwind_recover_return_address(struct kunwind_state *state)
 	if (state->task->ret_stack &&
 	    (state->common.pc == (unsigned long)return_to_handler)) {
 		unsigned long orig_pc;
-		orig_pc = ftrace_graph_ret_addr(state->task, NULL,
+		orig_pc = ftrace_graph_ret_addr(state->task, &state->graph_idx,
 						state->common.pc,
 						(void *)state->common.fp);
 		if (WARN_ON_ONCE(state->common.pc == orig_pc))