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Add tracepoints for display FIFO underruns. Makes it more convenient to correlate the underruns with other display tracepoints. v2: s/i915/intel/ in the tracepoint name Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170302171508.1666-19-ville.syrjala@linux.intel.com