tracing: Keep overwrite in sync between regular and snapshot buffers (80902822) · Commits · 戴 / test

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>

kernel/trace/trace.c

+5 −1

Original line number	Original line	Diff line number	Diff line
	@@ -2895,8 +2895,12 @@ static void set_tracer_flags(unsigned int mask, int enabled)
	if (mask == TRACE_ITER_RECORD_CMD)		if (mask == TRACE_ITER_RECORD_CMD)
	trace_event_enable_cmd_record(enabled);		trace_event_enable_cmd_record(enabled);

	if (mask == TRACE_ITER_OVERWRITE)		if (mask == TRACE_ITER_OVERWRITE) {
	ring_buffer_change_overwrite(global_trace.buffer, enabled);		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)		if (mask == TRACE_ITER_PRINTK)
	trace_printk_start_stop_comm(enabled);		trace_printk_start_stop_comm(enabled);

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