Re: RFC: switch the remaining architectures to use generic GUP v2

From: Christoph Hellwig <hch@lst.de>
Date: Sat,  1 Jun 2019 09:49:43 +0200

below is a series to switch mips, sh and sparc64 to use the generic
GUP code so that we only have one codebase to touch for further
improvements to this code.  I don't have hardware for any of these
architectures, and generally no clue about their page table
management, so handle with care.

Changes since v1:
 - fix various issues found by the build bot
 - cherry pick and use the untagged_addr helper form Andrey
 - add various refactoring patches to share more code over architectures
 - move the powerpc hugepd code to mm/gup.c and sync it with the generic
   hup semantics

I will today look seriously at the sparc64 stuff wrt. tagged pointers.