From: Jason Gunthorpe <jgg@nvidia.com>
To: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Oleg Nesterov <oleg@redhat.com>,
Richard Cochran <richardcochran@gmail.com>,
John Hubbard <jhubbard@nvidia.com>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH 4/4] mm/gup: adapt get_user_page_vma_remote() to never return NULL
Date: Mon, 9 Oct 2023 19:24:03 -0300 [thread overview]
Message-ID: <20231009222403.GE3952@nvidia.com> (raw)
In-Reply-To: <b57d5f6618818f2f781a664039ace025c932074c.1696174961.git.lstoakes@gmail.com>
On Sun, Oct 01, 2023 at 05:00:05PM +0100, Lorenzo Stoakes wrote:
> get_user_pages_remote() will never return 0 except in the case of
> FOLL_NOWAIT being specified, which we explicitly disallow.
>
> This simplifies error handling for the caller and avoids the awkwardness of
> dealing with both errors and failing to pin. Failing to pin here is an
> error.
>
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
> ---
> arch/arm64/kernel/mte.c | 4 ++--
> include/linux/mm.h | 16 +++++++++++++---
> kernel/events/uprobes.c | 4 ++--
> mm/memory.c | 3 +--
> 4 files changed, 18 insertions(+), 9 deletions(-)
Good riddance to IS_ERR_OR_NULL
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2023-10-09 22:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-01 16:00 [PATCH 0/4] various improvements to the GUP interface Lorenzo Stoakes
2023-10-01 16:00 ` [PATCH 1/4] mm: make __access_remote_vm() static Lorenzo Stoakes
2023-10-02 10:59 ` David Hildenbrand
2023-10-09 22:16 ` Jason Gunthorpe
2023-10-01 16:00 ` [PATCH 2/4] mm/gup: explicitly define and check internal GUP flags, disallow FOLL_TOUCH Lorenzo Stoakes
2023-10-02 11:00 ` David Hildenbrand
2023-10-09 22:19 ` Jason Gunthorpe
2023-10-01 16:00 ` [PATCH 3/4] mm/gup: make failure to pin an error if FOLL_NOWAIT not specified Lorenzo Stoakes
2023-10-02 11:04 ` David Hildenbrand
2023-10-02 22:51 ` Lorenzo Stoakes
2023-10-09 22:22 ` Jason Gunthorpe
2023-10-01 16:00 ` [PATCH 4/4] mm/gup: adapt get_user_page_vma_remote() to never return NULL Lorenzo Stoakes
2023-10-02 10:16 ` Catalin Marinas
2023-10-02 11:08 ` David Hildenbrand
2023-10-02 22:56 ` Lorenzo Stoakes
2023-10-09 22:24 ` Jason Gunthorpe [this message]
2023-10-01 17:39 ` [PATCH 0/4] various improvements to the GUP interface Arnd Bergmann
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