tracing: Allow dumping traces without tracking trace started cpus

We don't init iter->started when dumping the ftrace buffer, and there's no
real need to do so - so allow skipping that check if the iter doesn't have
an initialized ->started cpumask.

Link: http://lkml.kernel.org/r/1441385156-27279-1-git-send-email-sasha.levin@oracle.com
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 67873c67665e94a1105852ffd555ac4ffdc55568..6459e141aac37734c8a1ea3865354cd73abcff0c 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2671,13 +2671,14 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
        if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
                return;
 
-       if (cpumask_test_cpu(iter->cpu, iter->started))
+       if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))
                return;
 
        if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)
                return;
 
-       cpumask_set_cpu(iter->cpu, iter->started);
+       if (iter->started)
+               cpumask_set_cpu(iter->cpu, iter->started);
 
        /* Don't print started cpu buffer for the first entry of the trace */
        if (iter->idx > 1)