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Message-ID: <cover.1696174961.git.lstoakes@gmail.com>
Date: Sun, 1 Oct 2023 17:00:01 +0100
From: Lorenzo Stoakes <lstoakes@...il.com>
To: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Oleg Nesterov <oleg@...hat.com>,
Richard Cochran <richardcochran@...il.com>,
Jason Gunthorpe <jgg@...dia.com>,
John Hubbard <jhubbard@...dia.com>,
Arnd Bergmann <arnd@...db.de>,
Lorenzo Stoakes <lstoakes@...il.com>
Subject: [PATCH 0/4] various improvements to the GUP interface
A series of fixes to simplify and improve the GUP interface with an eye to
providing groundwork to future improvements:-
* __access_remote_vm() and access_remote_vm() are functionally identical,
so make the former static such that in future we can potentially change
the external-facing implementation details of this function.
* Extend is_valid_gup_args() to cover the missing FOLL_TOUCH case, and
simplify things by defining INTERNAL_GUP_FLAGS to check against.
* Adjust __get_user_pages_locked() to explicitly treat a failure to pin any
pages as an error in all circumstances other than FOLL_NOWAIT being
specified, bringing it in line with the nommu implementation of this
function.
* (With many thanks to Arnd who suggested this in the first instance)
Update get_user_page_vma_remote() to explicitly only return a page or an
error, simplifying the interface and avoiding the questionable
IS_ERR_OR_NULL() pattern.
Lorenzo Stoakes (4):
mm: make __access_remote_vm() static
mm/gup: explicitly define and check internal GUP flags, disallow
FOLL_TOUCH
mm/gup: make failure to pin an error if FOLL_NOWAIT not specified
mm/gup: adapt get_user_page_vma_remote() to never return NULL
arch/arm64/kernel/mte.c | 4 ++--
include/linux/mm.h | 18 +++++++++++++-----
kernel/events/uprobes.c | 4 ++--
kernel/ptrace.c | 2 +-
mm/gup.c | 16 +++++++++++++---
mm/internal.h | 3 +++
mm/memory.c | 7 +++----
mm/nommu.c | 4 ++--
8 files changed, 39 insertions(+), 19 deletions(-)
--
2.42.0
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