trace-cmd: Allow use of enabling the nop tracer

For those cases that we just want to enable tracing because
we want to view trace_printk()s in the kernel or for whatever,
allow the nop tracer to be enabled.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/trace-record.c b/trace-record.c
index fa23b82..9b331ef 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -1855,6 +1855,13 @@ static void check_plugin(const char *plugin)
         char *buf;
         char *tok;
 
+        /*
+         * nop is special. We may want to just trace
+         * trace_printks, that are in the kernel.
+         */
+        if (strcmp(plugin, "nop") == 0)
+                return;
+
         buf = read_file("available_tracers", NULL);
         if (!buf)
                 die("No plugins available");