On Thu, Dec 07, 2017 at 10:50:38AM -0800, Kees Cook wrote:

My question is mainly: why not just use copy_*() everywhere instead?
Having these things so spread out makes it fragile, and there's very
little performance benefit from using __copy_*() over copy_*().

I think that's more of a general question. Why not just remove the __
versions from the kernel entirely if they're not worth the perf?

Will