From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Sat, 25 Jan 2014 00:16:08 +0000 (-0500)
Subject: Fix: tracepoint name remapping
X-Git-Tag: v2.3.5~7
X-Git-Url: https://git.lttng.org/?p=lttng-modules.git;a=commitdiff_plain;h=31ea72b728972005fd291acae493cb96611e5b63

Fix: tracepoint name remapping

Commit

  "Introduce API to remap event names exposed by LTTng"

failed to map the event names enabled by the user to tracepoint names
known to the kernel. For instance, tracing with the kmem_kmalloc event
enabled is not gathering any event. This issue applies to all tracepoint
events declared with a different name within LTTng than within the Linux
kernel.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lttng-events.c b/lttng-events.c
index c1b3b44d..5b3416ab 100644
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -400,7 +400,7 @@ struct lttng_event *lttng_event_create(struct lttng_channel *chan,
 			ret = -ENOENT;
 			goto register_error;
 		}
-		ret = kabi_2635_tracepoint_probe_register(event_param->name,
+		ret = kabi_2635_tracepoint_probe_register(event->desc->kname,
 				event->desc->probe_callback,
 				event);
 		if (ret) {
diff --git a/lttng-events.h b/lttng-events.h
index bc5cd9f5..cf31b2e1 100644
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -169,7 +169,8 @@ struct lttng_ctx {
 };
 
 struct lttng_event_desc {
-	const char *name;
+	const char *name;		/* lttng-modules name */
+	const char *kname;		/* Linux kernel name (tracepoints) */
 	void *probe_callback;
 	const struct lttng_event_ctx *ctx;	/* context */
 	const struct lttng_event_field *fields;	/* event payload */
diff --git a/probes/lttng-events.h b/probes/lttng-events.h
index bf2e2b9d..680f466f 100644
--- a/probes/lttng-events.h
+++ b/probes/lttng-events.h
@@ -327,6 +327,7 @@ static void __event_probe__##_name(void *__data);
 static const struct lttng_event_desc __event_desc___##_map = {		\
 	.fields = __event_fields___##_template,		     		\
 	.name = #_map,					     		\
+	.kname = #_name,				     		\
 	.probe_callback = (void *) TP_PROBE_CB(_template),   		\
 	.nr_fields = ARRAY_SIZE(__event_fields___##_template),		\
 	.owner = THIS_MODULE,				     		\