[for-next][PATCH 09/13] tracing: Allow dumping traces without tracking trace started cpus

From: Steven Rostedt
Date: Wed Nov 04 2015 - 10:33:29 EST

From: Sasha Levin <sasha.levin@xxxxxxxxxx>

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@xxxxxxxxxx

Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
kernel/trace/trace.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 67873c67665e..6459e141aac3 100644
--- 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))

- if (cpumask_test_cpu(iter->cpu, iter->started))
+ if (iter->started && cpumask_test_cpu(iter->cpu, iter->started))

if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries)

- 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)

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