tracing: Add binary '&' filter for events

[firefly-linux-kernel-4.4.55.git] / kernel / trace / trace_events_filter.c

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index e1b653f7e1ca101f0861351d610b5c8297a4b3ca..0d883dc057d68fe92bc36f0510298cff725256bb 100644 (file)
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -44,6 +44,7 @@ enum filter_op_ids
        OP_LE,
        OP_GT,
        OP_GE,
+       OP_BAND,
        OP_NONE,
        OP_OPEN_PAREN,
 };
@@ -54,6 +55,7 @@ struct filter_op {
        int precedence;
 };
 
+/* Order must be the same as enum filter_op_ids above */
 static struct filter_op filter_ops[] = {
        { OP_OR,        "||",           1 },
        { OP_AND,       "&&",           2 },
@@ -64,6 +66,7 @@ static struct filter_op filter_ops[] = {
        { OP_LE,        "<=",           5 },
        { OP_GT,        ">",            5 },
        { OP_GE,        ">=",           5 },
+       { OP_BAND,      "&",            6 },
        { OP_NONE,      "OP_NONE",      0 },
        { OP_OPEN_PAREN, "(",           0 },
 };
@@ -156,6 +159,9 @@ static int filter_pred_##type(struct filter_pred *pred, void *event)        \
        case OP_GE:                                                     \
                match = (*addr >= val);                                 \
                break;                                                  \
+       case OP_BAND:                                                   \
+               match = (*addr & val);                                  \
+               break;                                                  \
        default:                                                        \
                break;                                                  \
        }                                                               \