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tracing: Keep overwrite in sync between regular and snapshot buffers

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Changing the overwrite mode for the ring buffer via the trace
option only sets the normal buffer. But the snapshot buffer could
swap with it, and then the snapshot would be in non overwrite mode
and the normal buffer would be in overwrite mode, even though the
option flag states otherwise.

Keep the two buffers overwrite modes in sync.

Cc: stable@vger.kernel.org
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-03-14 14:20:54 -04:00 committed by Steven Rostedt
parent 69d34da298
commit 8090282265
1 changed files with 5 additions and 1 deletions
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6
kernel/trace/trace.c
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@ -2895,8 +2895,12 @@ static void set_tracer_flags(unsigned int mask, int enabled)
if (mask == TRACE_ITER_RECORD_CMD)
trace_event_enable_cmd_record(enabled);
if (mask == TRACE_ITER_OVERWRITE)
if (mask == TRACE_ITER_OVERWRITE) {
ring_buffer_change_overwrite(global_trace.buffer, enabled);
#ifdef CONFIG_TRACER_MAX_TRACE
ring_buffer_change_overwrite(max_tr.buffer, enabled);
#endif
}
if (mask == TRACE_ITER_PRINTK)
trace_printk_start_stop_comm(enabled);