tracing: Add comment to predicate_parse() about "&&" or "||"

As the predicat_parse() code is rather complex, commenting subtleties is
important. The switch case statement should be commented to describe that it
is only looking for two '&' or '|' together, which is why the fall through
to an error is after the check.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index eb694756c4bb94153fccc983797372ad27c414e3..f052ecb085e96f7fe05b00953205c927601bb772 100644 (file)
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -491,6 +491,7 @@ predicate_parse(const char *str, int nr_parens, int nr_preds,
                                break;
                        case '&':
                        case '|':
+                               /* accepting only "&&" or "||" */
                                if (next[1] == next[0]) {
                                        ptr++;
                                        break;