Re: [RFC 5/8] scatterlist: Modify SG copy functions to support io memory.
From: Christoph Hellwig
Date: Fri Mar 31 2017 - 03:10:24 EST
You're calling memcpy_{to,from}_iomem on non-__iomem pointers. This
is a fundamental no-go as we keep I/O memory separate from kernel
pointers.