idle_ret_stack    460 kernel/trace/fgraph.c static DEFINE_PER_CPU(struct ftrace_ret_stack *, idle_ret_stack);
idle_ret_stack    486 kernel/trace/fgraph.c 		WARN_ON(t->ret_stack != per_cpu(idle_ret_stack, cpu));
idle_ret_stack    491 kernel/trace/fgraph.c 		ret_stack = per_cpu(idle_ret_stack, cpu);
idle_ret_stack    499 kernel/trace/fgraph.c 			per_cpu(idle_ret_stack, cpu) = ret_stack;