At least in Tamil Nadu, "smarta" is a synonym for "Iyer" - who subscribe to Advaita as a philosophy and do not explicitly reject ANY Hindu deity.
Did Tamil Vaishnavites (Iyengars) descend from Shaivites (Iyers)?
says Srivaishnavites are descended from Iyers - i.e,. were Smartas.
Do Srivaishnavites explicitly reject being Smartas now?