linux-kernel - Re: [PATCH 4/4] mm/gup: adapt get_user_page_vma

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Message-ID: <20231009222403.GE3952@nvidia.com>
Date:   Mon, 9 Oct 2023 19:24:03 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>
Cc:     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>,
        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>,
        John Hubbard <jhubbard@...dia.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 4/4] mm/gup: adapt get_user_page_vma_remote() to never
 return NULL

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@...db.de>
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.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@...dia.com>

Jason