X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fenable_channels.c;h=4a737d28d9ae07a4cb2731d74f3c1bffbffa1e5e;hb=f11e84c2c33f6e2f4da8436012bcc61b3291b0d7;hp=692480e816f28c2e2d808d326a8520c2a59e750d;hpb=5853fd43129ab32dd54fff779076c67234eb73dc;p=lttng-tools.git

diff --git a/src/bin/lttng/commands/enable_channels.c b/src/bin/lttng/commands/enable_channels.c
index 692480e81..4a737d28d 100644
--- a/src/bin/lttng/commands/enable_channels.c
+++ b/src/bin/lttng/commands/enable_channels.c
@@ -104,10 +104,13 @@ static void usage(FILE *ofp)
 	fprintf(ofp, "                               (default: %u, kernel default: %u)\n",
 		DEFAULT_CHANNEL_SUBBUF_SIZE,
 		DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE);
+	fprintf(ofp, "                               Needs to be a power of 2 for\n");
+        fprintf(ofp, "                               kernel and ust tracers\n");
 	fprintf(ofp, "      --num-subbuf NUM     Number of subbufers\n");
-	fprintf(ofp, "                               (default: %u, kernel default: %u)\n",
-		DEFAULT_CHANNEL_SUBBUF_NUM,
-		DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM);
+	fprintf(ofp, "                               (default: %u)\n",
+		DEFAULT_CHANNEL_SUBBUF_NUM);
+	fprintf(ofp, "                               Needs to be a power of 2 for\n");
+        fprintf(ofp, "                               kernel and ust tracers\n");
 	fprintf(ofp, "      --switch-timer USEC  Switch timer interval in usec (default: %u)\n",
 		DEFAULT_CHANNEL_SWITCH_TIMER);
 	fprintf(ofp, "      --read-timer USEC    Read timer interval in usec (default: %u)\n",
@@ -155,6 +158,8 @@ static int enable_channel(char *session_name)
 	char *channel_name;
 	struct lttng_domain dom;
 
+	memset(&dom, 0, sizeof(dom));
+
 	/* Create lttng domain */
 	if (opt_kernel) {
 		dom.type = LTTNG_DOMAIN_KERNEL;