perf scripts python: call-graph-from-sql.py: Make a "Main" function

Make a "Main" function so that the variables used do not pollute the global
namespace.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20181001062853.28285-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/tools/perf/scripts/python/call-graph-from-sql.py b/tools/perf/scripts/python/call-graph-from-sql.py
index 2e33540f3de0..2b74b94eeccc 100644
--- a/tools/perf/scripts/python/call-graph-from-sql.py
+++ b/tools/perf/scripts/python/call-graph-from-sql.py
@@ -284,7 +284,9 @@ class MainWindow(QMainWindow):
 
                 self.setCentralWidget(self.view)
 
-if __name__ == '__main__':
+# Main
+
+def Main():
         if (len(sys.argv) < 2):
                 print >> sys.stderr, "Usage is: call-graph-from-sql.py <database name>"
                 raise Exception("Too few arguments")
@@ -331,3 +333,6 @@ if __name__ == '__main__':
         err = app.exec_()
         db.close()
         sys.exit(err)
+
+if __name__ == "__main__":
+        Main()