tracing/function-graph-tracer: strip ending newlines on comments

Impact: tracer output improvement

Ending newlines are appended automatically on comments by the function
graph tracer because the newline needs to be placed after the "*/"
comment characters.

So if the user puts an ending newline, we want to strip it.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 4bf39fcae97a..bc7d90850be5 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -592,6 +592,12 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
 	if (ent->flags & TRACE_FLAG_CONT)
 		trace_seq_print_cont(s, iter);
 
+	/* Strip ending newline */
+	if (s->buffer[s->len - 1] == '\n') {
+		s->buffer[s->len - 1] = '\0';
+		s->len--;
+	}
+
 	ret = trace_seq_printf(s, " */\n");
 	if (!ret)
 		return TRACE_TYPE_PARTIAL_LINE;