trace_stack
len = trace_stack(entry, event, stack,
trace_stack(tr);
trace_stack(tr);
trace_stack(tr);
static DEFINE_PER_CPU(struct trace_stack, trace_stack);
struct trace_stack *fstack;
fstack = this_cpu_ptr(&trace_stack);
__timerlat_dump_stack(struct trace_buffer *buffer, struct trace_stack *fstack, unsigned int size)
struct trace_stack *fstack;
fstack = this_cpu_ptr(&trace_stack);