tracing: Allow NOT to filter AND and OR clauses

Add support to allow not "!" for and (&&) and (||). That is:

 !(field1 == X && field2 == Y)

Where the value of the full clause will be notted.

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

1 files changed, 5 insertions, 4 deletions

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e6a33db83856..ced69da0ff55 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -489,9 +489,10 @@ static int process_ops(struct filter_pred *preds,
                 if (!WARN_ON_ONCE(!pred->fn))
                         match = pred->fn(pred, rec);
                 if (!!match == type)
-                        return match;
+                        break;
         }
-        return match;
+        /* If not of not match is equal to not of not, then it is a match */
+        return !!match == !op->not;
 }
 
 struct filter_match_preds_data {
@@ -740,10 +741,10 @@ static int filter_set_pred(struct event_filter *filter,
                  * then this op can be folded.
                  */
                 if (left->index & FILTER_PRED_FOLD &&
-                    (left->op == dest->op ||
+                    ((left->op == dest->op && !left->not) ||
                      left->left == FILTER_PRED_INVALID) &&
                     right->index & FILTER_PRED_FOLD &&
-                    (right->op == dest->op ||
+                    ((right->op == dest->op && !right->not) ||
                      right->left == FILTER_PRED_INVALID))
                         dest->index |= FILTER_PRED_FOLD;