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

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Date:   Sat, 01 Jun 2019 16:46:43 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     hch@....de
Cc:     torvalds@...ux-foundation.org, paul.burton@...s.com,
        jhogan@...nel.org, ysato@...rs.sourceforge.jp, dalias@...c.org,
        npiggin@...il.com, khalid.aziz@...cle.com, andreyknvl@...gle.com,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        linux-mips@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: RFC: switch the remaining architectures to use generic GUP v2

From: Christoph Hellwig <hch@....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.