linux-kernel - Re: [PATCH v5 0/5] mm/gup: some cleanups

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Date:   Fri, 11 Feb 2022 16:24:15 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     David Hildenbrand <david@...hat.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH v5 0/5] mm/gup: some cleanups

On 2/6/22 22:22, John Hubbard wrote:
> Hi,
> 
> Here's an update, mainly just collecting reviewed-by tags:
> 
> Changes since v4:
> 
>      * Patch 1: reflowed the commit description to 72 columns.
> 
>      * Added reviewed-by's from Christoph and Jan for remaining patches.
> 
>      * Rebased onto 5.17-rc3.
> 

Hi Andrew,

Is this OK to put in mmotm yet? All the patches here have been reviewed.
And this small series also does not conflict with Willy's "[PATCH 00/75]
MM folio patches for 5.18" series.


thanks,
John Hubbard

> 
> Changes since v3:
> 
>      * Patch 1: Commit log: removed a reference to an out of tree module,
>        and updated tags and added a short note to that effect.
> 
>      * Patch 2: Fixed up do_move_pages(), to squash -EEXIST returns from
>        follow_page() into something that move_pages() allows: -EFAULT.
>        This is from reviews by Jan Kara, Matthew Wilcox, Jason Gunthorpe.
> 
>        Removed all Reviewed-by tags for this patch, due to that update.
> 
>      * Patch 4: Split into two patches, as recommended by Christoph
>        Hellwig. Left the Reviewed-by tags intact because no code changes
>        were required.
> 
>      * Added Reviewed-by tags from Claudio Imbrenda.
> 
> Changes since v2:
> 
>      * Patch 2: Removed an unnecessary line that was causing a
>        clang-analyzer complaint, as reported by Lukas Bulwahn
>        [1] (thanks!), and retested locally.
> 
>        Jason: I've boldly left your Reviewed-by tag on this patch,
>        because I am predicting you'll agree with it...
> 
>      * Added Reviewed-by tags from Jan Kara, Christoph Hellwig, and
>        Jason Gunthorpe that have collected since v2.
> 
> 
> Changes since v1:
>      * Patch 4: changed from get_user_pages(), to get_user_pages_fast().
> 
>      * Patch 4: Rewrote the commit description--thanks to Jan Kara for
>                 that feedback.
> 
>      * Patch 1: Removed Jerome's Cc from patch 1, due to a stale email
>                 address.
> 
>      * Added Reviewed-by's from David Hildenbrand and Jason Gunthorpe.
> 
> Original cover letter, updated as necessary:
> 
> I'm including Peter's patch as the first one in this tiny series. (The
> commit description has my r-b tag in place of my Cc, and removes
> Jerome's Cc because he is no longer at redhat.com) The second patch is
> what I had in mind for a follow-up to that, when we were discussing that
> fix [2].
> 
> Plus, a couple more small removals that I had queued up:
> 
> The third patch removes a completely unused routine:
> pin_user_pages_locked().
> 
> The forth patch removes a similar routine, get_user_pages_locked(), that
> only has one caller. It now calls get_user_pages_fast(), instead.
> 
> v1 of this patchset is here:
> https://lore.kernel.org/all/20220131051752.447699-1-jhubbard@nvidia.com/
> 
> v2:
> https://lore.kernel.org/r/20220201101108.306062-1-jhubbard@nvidia.com
> 
> v3:
> https://lore.kernel.org/r/20220203093232.572380-1-jhubbard@nvidia.com
> 
> v4:
> https://lore.kernel.org/r/20220204020010.68930-1-jhubbard@nvidia.com
> 
> 
> [1] https://lore.kernel.org/r/CAKXUXMxFK9bo8jDoRZbQ0r2j-JwAGg3Xc5cpAcLaHfwHddJ7ew@mail.gmail.com
> 
> [2] https://lore.kernel.org/all/20220125033700.69705-1-peterx@redhat.com/
> 
> 
> John Hubbard (4):
>    mm/gup: follow_pfn_pte(): -EEXIST cleanup
>    mm/gup: remove unused pin_user_pages_locked()
>    mm: change lookup_node() to use get_user_pages_fast()
>    mm/gup: remove unused get_user_pages_locked()
> 
> Peter Xu (1):
>    mm: Fix invalid page pointer returned with FOLL_PIN gups
> 
>   include/linux/mm.h |   4 --
>   mm/gup.c           | 101 ++++-----------------------------------------
>   mm/mempolicy.c     |  21 ++++------
>   mm/migrate.c       |   7 ++++
>   4 files changed, 24 insertions(+), 109 deletions(-)
> 
> 
> base-commit: dfd42facf1e4ada021b939b4e19c935dcdd55566