linux-kernel - Re: [PATCH v2 3/4] mm/gup: make failure to pin an error if FOLL

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Message-ID: <387a6703-b8fb-d2ed-16b1-5264b2c901aa@redhat.com>
Date:   Fri, 6 Oct 2023 14:56:59 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Lorenzo Stoakes <lstoakes@...il.com>, 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>
Subject: Re: [PATCH v2 3/4] mm/gup: make failure to pin an error if
 FOLL_NOWAIT not specified

On 03.10.23 01:14, Lorenzo Stoakes wrote:
> There really should be no circumstances under which a non-FOLL_NOWAIT GUP
> operation fails to return any pages, so make this an error and warn on it.
> 
> To catch the trivial case, simply exit early if nr_pages == 0.
> 
> This brings __get_user_pages_locked() in line with the behaviour of its
> nommu variant.
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
> ---

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb