trace-cmd: Add '-q' to trace-cmd report to silence warnings

Added a -q option to trace-cmd report that will not print out
warnings about parsing errors.

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

4 files changed, 14 insertions, 1 deletions

diff --git a/Documentation/trace-cmd-report.txt b/Documentation/trace-cmd-report.txt
index aa033f5..028f2ca 100644
--- a/Documentation/trace-cmd-report.txt
+++ b/Documentation/trace-cmd-report.txt
@@ -134,6 +134,9 @@ OPTIONS
     this option will report the latency between the time the task was first
     woken, and the time it was scheduled in.
 
+*-q*::
+    Quiet non critical warnings.
+
 EXAMPLES
 --------
 
diff --git a/trace-cmd.c b/trace-cmd.c
index e85b550..e022dde 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -52,6 +52,8 @@
 
 #define UDP_MAX_PACKET (65536 - 20)
 
+int silence_warnings;
+
 static int use_tcp;
 
 static unsigned int page_size;
@@ -209,6 +211,9 @@ void warning(char *fmt, ...)
 {
         va_list ap;
 
+        if (silence_warnings)
+                return;
+
         if (errno)
                 perror("trace-cmd");
         errno = 0;
diff --git a/trace-local.h b/trace-local.h
index 4e44238..2c3d702 100644
--- a/trace-local.h
+++ b/trace-local.h
@@ -30,6 +30,8 @@ typedef unsigned long long u64;
 
 void usage(char **argv);
 
+extern int silence_warnings;
+
 struct tracecmd_input *read_trace_header(void);
 int read_trace_files(void);
 
diff --git a/trace-read.c b/trace-read.c
index ca6661e..2ec5e57 100644
--- a/trace-read.c
+++ b/trace-read.c
@@ -576,7 +576,7 @@ void trace_report (int argc, char **argv)
                         {NULL, 0, NULL, 0}
                 };
 
-                c = getopt_long (argc-1, argv+1, "+hi:fepPlEwF:v",
+                c = getopt_long (argc-1, argv+1, "+hi:fepPlEwF:vq",
                         long_options, &option_index);
                 if (c == -1)
                         break;
@@ -616,6 +616,9 @@ void trace_report (int argc, char **argv)
                                 die("Only 1 -v can be used");
                         neg = 1;
                         break;
+                case 'q':
+                        silence_warnings = 1;
+                        break;
                 case 0:
                         switch(option_index) {
                         case 0: