[PATCH v4 0/5] mm/gup: some cleanups

From: John Hubbard
Date: Thu Feb 03 2022 - 21:01:31 EST


Hi,

Thanks for all the reviews and feedbacks so far. Here is an update.

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@xxxxxxxxxx/

v2:
https://lore.kernel.org/r/20220201101108.306062-1-jhubbard@xxxxxxxxxx

v3:
https://lore.kernel.org/r/20220203093232.572380-1-jhubbard@xxxxxxxxxx

[1] https://lore.kernel.org/r/CAKXUXMxFK9bo8jDoRZbQ0r2j-JwAGg3Xc5cpAcLaHfwHddJ7ew@xxxxxxxxxxxxxx

[2] https://lore.kernel.org/all/20220125033700.69705-1-peterx@xxxxxxxxxx/


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: 1f2cfdd349b7647f438c1e552dc1b983da86d830
--
2.35.1