tracing: Add stack dump to trace_printk if stacktrace option is set

If the ftrace stacktrace option is set, then add the stack dumps to
trace_printk.

Requested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index abdd333..5314c90 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1392,8 +1392,10 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
        entry->fmt                      = fmt;
 
        memcpy(entry->buf, trace_buf, sizeof(u32) * len);
-       if (!filter_check_discard(call, entry, buffer, event))
+       if (!filter_check_discard(call, entry, buffer, event)) {
                ring_buffer_unlock_commit(buffer, event);
+               ftrace_trace_stack(buffer, flags, 6, pc);
+       }
 
 out_unlock:
        arch_spin_unlock(&trace_buf_lock);
@@ -1466,8 +1468,10 @@ int trace_array_vprintk(struct trace_array *tr,
 
        memcpy(&entry->buf, trace_buf, len);
        entry->buf[len] = '\0';
-       if (!filter_check_discard(call, entry, buffer, event))
+       if (!filter_check_discard(call, entry, buffer, event)) {
                ring_buffer_unlock_commit(buffer, event);
+               ftrace_trace_stack(buffer, irq_flags, 6, pc);
+       }
 
  out_unlock:
        arch_spin_unlock(&trace_buf_lock);