Barr (hand) is active for Sunday's game against the Packers.
With a varied line in his second campaign -- 47 tackles (39 solo), 1.5 sacks, one interception, and one forced fumbled in nine contests -- Barr will line up at strong-side linebacker in an attempt to corral Aaron Rodgers and company.
Smith (knee) has been ruled out for Sunday's game against the Falcons.
Smith sustained the injury early in last week's loss to Green Bay, but he played through the ailment for the better part of the contest. Despite practicing Friday, Smith has been ruled out, so the Vikings will likely turn to Antone Exum Jr. to fill the void.