linux-kernel - Re: [PATCH v2 19/22] mm/memremap_pages: Convert to 'struct range'

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Date:   Mon, 13 Jul 2020 09:54:49 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Ira Weiny <ira.weiny@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Joao Martins <joao.m.martins@...cle.com>
Subject: Re: [PATCH v2 19/22] mm/memremap_pages: Convert to 'struct range'

On Mon, Jul 13, 2020 at 9:36 AM Ralph Campbell <rcampbell@...dia.com> wrote:
>
>
> On 7/12/20 9:27 AM, Dan Williams wrote:
> > The 'struct resource' in 'struct dev_pagemap' is only used for holding
> > resource span information. The other fields, 'name', 'flags', 'desc',
> > 'parent', 'sibling', and 'child' are all unused wasted space.
> >
> > This is in preparation for introducing a multi-range extension of
> > devm_memremap_pages().
> >
> > The bulk of this change is unwinding all the places internal to
> > libnvdimm that used 'struct resource' unnecessarily.
> >
> > P2PDMA had a minor usage of the flags field, but only to report failures
> > with "%pR". That is replaced with an open coded print of the range.
> >
> > Cc: Paul Mackerras <paulus@...abs.org>
> > Cc: Michael Ellerman <mpe@...erman.id.au>
> > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > Cc: Dan Williams <dan.j.williams@...el.com>
> > Cc: Vishal Verma <vishal.l.verma@...el.com>
> > Cc: Dave Jiang <dave.jiang@...el.com>
> > Cc: Ben Skeggs <bskeggs@...hat.com>
> > Cc: David Airlie <airlied@...ux.ie>
> > Cc: Daniel Vetter <daniel@...ll.ch>
> > Cc: Ira Weiny <ira.weiny@...el.com>
> > Cc: Jason Gunthorpe <jgg@...lanox.com>
> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> > ---
> >   arch/powerpc/kvm/book3s_hv_uvmem.c     |   13 +++--
> >   drivers/dax/bus.c                      |   10 ++--
> >   drivers/dax/bus.h                      |    2 -
> >   drivers/dax/dax-private.h              |    5 --
> >   drivers/dax/device.c                   |    3 -
> >   drivers/dax/hmem/hmem.c                |    5 ++
> >   drivers/dax/pmem/core.c                |   12 ++---
> >   drivers/gpu/drm/nouveau/nouveau_dmem.c |    3 +
> >   drivers/nvdimm/badrange.c              |   26 +++++------
> >   drivers/nvdimm/claim.c                 |   13 +++--
> >   drivers/nvdimm/nd.h                    |    3 +
> >   drivers/nvdimm/pfn_devs.c              |   12 ++---
> >   drivers/nvdimm/pmem.c                  |   26 ++++++-----
> >   drivers/nvdimm/region.c                |   21 +++++----
> >   drivers/pci/p2pdma.c                   |   11 ++---
> >   include/linux/memremap.h               |    5 +-
> >   include/linux/range.h                  |    6 ++
> >   mm/memremap.c                          |   77 ++++++++++++++++----------------
> >   tools/testing/nvdimm/test/iomap.c      |    2 -
> >   19 files changed, 135 insertions(+), 120 deletions(-)
>
> I think you are missing a call to memremap_pages() in lib/test_hmm.c
> and a call to release_mem_region() that need to be converted too.
> Try setting CONFIG_TEST_HMM=m.

Thanks Ralph, looks like I overlooked these changes since the rebase.

> Also, what about the call to release_mem_region() in
> drivers/gpu/drm/nouveau/nouveau_dmem.c? Doesn't that need a small change too?

I'll double check my config, that one should have been flagged at build time.