Commit cec8d0e7 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

sh: ftrace: Use ftrace_graph_get_ret_stack() instead of curr_ret_stack 



The structure of the ret_stack array on the task struct is going to
change, and accessing it directly via the curr_ret_stack index will no
longer give the ret_stack entry that holds the return address. To access
that, architectures must now use ftrace_graph_get_ret_stack() to get the
associated ret_stack that matches the saved return address.

Cc: linux-sh@vger.kernel.org
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 945626db

arch/sh/kernel/dumpstack.c

+7 −4
Original line number Diff line number Diff line
@@ -59,17 +59,20 @@ print_ftrace_graph_addr(unsigned long addr, void *data, 
			struct thread_info *tinfo, int *graph)

{

	struct task_struct *task = tinfo->task;

	struct ftrace_ret_stack *ret_stack;

	unsigned long ret_addr;

	int index = task->curr_ret_stack;



	if (addr != (unsigned long)return_to_handler)

		return;



	if (!task->ret_stack || index < *graph)

	if (!task->ret_stack)

		return;



	index -= *graph;

	ret_addr = task->ret_stack[index].ret;

	ret_stack = ftrace_graph_get_ret_stack(task, *graph);

	if (!ret_stack)

		return;



	ret_addr = ret_stack->ret;



	ops->address(data, ret_addr, 1);

arch/sh/kernel/dwarf.c

+5 −4
Original line number Diff line number Diff line
@@ -608,17 +608,18 @@ struct dwarf_frame *dwarf_unwind_stack(unsigned long pc, 
	 * expected to find the real return address.

	 */

	if (pc == (unsigned long)&return_to_handler) {

		int index = current->curr_ret_stack;

		struct ftrace_ret_stack *ret_stack;



		ret_stack = ftrace_graph_get_ret_stack(current, 0);

		if (ret_stack)

			pc = ret_stack->ret;

		/*

		 * We currently have no way of tracking how many

		 * return_to_handler()'s we've seen. If there is more

		 * than one patched return address on our stack,

		 * complain loudly.

		 */

		WARN_ON(index > 0);



		pc = current->ret_stack[index].ret;

		WARN_ON(ftrace_graph_get_ret_stack(current, 1);

	}

#endif

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