From a8b6e56874ed9cc5d6c63e747a20d4ae73ab607d Mon Sep 17 00:00:00 2001
From: Douglas RAILLARD <douglas.raillard@arm.com>
Date: Mon, 25 Mar 2019 14:21:55 +0000
Subject: [PATCH] trace: dmesg: Call dmesg -c as root

Clearing the kernel ring buffer needs root permission.
---
 devlib/trace/dmesg.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/devlib/trace/dmesg.py b/devlib/trace/dmesg.py
index 4b43912..90805d6 100644
--- a/devlib/trace/dmesg.py
+++ b/devlib/trace/dmesg.py
@@ -164,7 +164,7 @@ class DmesgCollector(TraceCollector):
     def start(self):
         self.reset()
         # Empty the dmesg ring buffer
-        self.target.execute('dmesg -c')
+        self.target.execute('dmesg -c', as_root=True)
 
     def stop(self):
         levels_list = list(takewhile(