Don't put the post through the walk. There are a couple ways of detailing this, so I'll mention one that hasn't been brought up, assuming 4X4 post.
Fasten your post ends to a 2X4 spaced so that it all can slip in place. This would normally be let in to the bottom of the stringers. Put it in place, fasten it all into the stringers, tapcon to the walk.
This method helps spread the fasteners around to decrease splitting problems, but there is a little joinery involved to make it look good / cover up the end of the 2X4.