From: Steven Rostedt (Red Hat) Date: Thu, 14 Mar 2013 18:20:54 +0000 (-0400) Subject: tracing: Keep overwrite in sync between regular and snapshot buffers X-Git-Tag: firefly_0821_release~3680^2~671^2~83 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=80902822658aab18330569587cdb69ac1dfdcea8;p=firefly-linux-kernel-4.4.55.git tracing: Keep overwrite in sync between regular and snapshot buffers 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 --- diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 00daf5f8c50b..02debabe9ed4 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -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);