SAN FRANCISCO--(BUSINESS WIRE)--McKesson Corporation (NYSE: MCK) today reported that revenues for the second quarter ended September 30, 2011 were up 10% to $30.2 billion compared to $27.5 billion a year ago. On the basis of U.S. generally accepted accounting principles (“GAAP”), second-quarter earnings per diluted share was $1.18 compared to $1.25 a year ago.