kernel-shark: Show warning message when running as Root

Running the KernelShark GUI with Root privileges is not recommended due
to security reasons. The user will be allowed to continue on its own risk.

Link: http://lore.kernel.org/linux-trace-devel/20190920102852.22769-2-y.karadz@gmail.com

Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204475
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2 files changed