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The tracing infrastructure is adding a macro TRACE_SYSTEM_STRING, and
hit the following build failure:

   In file included from include/trace/define_trace.h:90:0,
                    from drivers/gpu/drm/.//radeon/radeon_trace.h:209,
                    from drivers/gpu/drm/.//radeon/radeon_trace_points.c:9:
>> include/trace/ftrace.h:28:0: warning: "TRACE_SYSTEM_STRING" redefined
    #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)

Seems that the DRM folks have added their own use to the
TRACE_SYSTEM_STRING, with:

 #define TRACE_SYSTEM_STRING __stringify(TRACE_SYSTEM)

Although, I can not find its use anywhere. I could simply use another
name, but if this macro is not being used, it should be removed.

Link: http://lkml.kernel.org/r/20150402123736.01eda052@gandalf.local.home

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <danie...