perf utils: Add perf_quiet_option()

The perf_quiet_option() is to suppress all messages.  It's intended to
be called just after parsing options.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170217081742.17417-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index c1838b643108..03eb81f30d0d 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -203,11 +203,28 @@ int perf_debug_option(const char *str)
                 v = (v < 0) || (v > 10) ? 0 : v;
         }
 
+        if (quiet)
+                v = -1;
+
         *var->ptr = v;
         free(s);
         return 0;
 }
 
+int perf_quiet_option(void)
+{
+        struct debug_variable *var = &debug_variables[0];
+
+        /* disable all debug messages */
+        while (var->name) {
+                *var->ptr = -1;
+                var++;
+        }
+
+        quiet = true;
+        return 0;
+}
+
 #define DEBUG_WRAPPER(__n, __l)                         \
 static int pr_ ## __n ## _wrapper(const char *fmt, ...) \
 {                                                       \
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index d242adc3d5a2..98832f5531d3 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -54,5 +54,6 @@ int veprintf(int level, int var, const char *fmt, va_list args);
 
 int perf_debug_option(const char *str);
 void perf_debug_setup(void);
+int perf_quiet_option(void);
 
 #endif  /* __PERF_DEBUG_H */