I'm surprised there aren't more studies in how code going into the kernel is reviewed. There are various subsystems that have different levels of review. And

I'm surprised there aren't more studies in how code going into the kernel is reviewed. There are various subsystems that have different levels of review. And it is largely done "in public" for the final set of changes. Heck, many of the tools we take for granted now were sharpened on the kernel.