From: Steven Rostedt The mmio tracer has its own function to handle reading of events. But if it encounters an event that it does not understand it ignores it instead of telling the calling function that it is not processing it. If someone adds trace_printk() or enables events along with the mmio tracer, then these events will not be displayed in the trace output. Simple solution is to just have the mmio print return UNHANDLED to let the caller know that it did not processes the event and the caller can process the event further. Reported-by: Larry Finger Cc: Pekka Paalanen Signed-off-by: Steven Rostedt --- kernel/trace/trace_mmiotrace.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c index 017fa37..592c00f 100644 --- a/kernel/trace/trace_mmiotrace.c +++ b/kernel/trace/trace_mmiotrace.c @@ -282,7 +282,8 @@ static enum print_line_t mmio_print_line(struct trace_iterator *iter) case TRACE_PRINT: return mmio_print_mark(iter); default: - return TRACE_TYPE_HANDLED; /* ignore unknown entries */ + /* Not our event */ + return TRACE_TYPE_UNHANDLED; } } -- 1.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/