linux-kernel - Re: [PATCH v2 2/6] userfaultfd: add /dev/userfaultfd for fine grained access control

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Message-ID: <CAK8P3a0th99KbPO_Mt17uztHay6vBMngT-ii2dFW4++BaAQNpw@mail.gmail.com>
Date:   Tue, 26 Apr 2022 19:13:47 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     "Dmitry V. Levin" <ldv@...linux.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Charan Teja Reddy <charante@...eaurora.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Gleb Fotengauer-Malinovskiy <glebfm@...linux.org>,
        Hugh Dickins <hughd@...gle.com>, Jan Kara <jack@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>, Nadav Amit <namit@...are.com>,
        Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        zhangyi <yi.zhang@...wei.com>,
        Linux API <linux-api@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Linuxkselftest <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] userfaultfd: add /dev/userfaultfd for fine grained
 access control

On Tue, Apr 26, 2022 at 6:00 PM Axel Rasmussen <axelrasmussen@...gle.com> wrote:
>
> You're right, [1] says _IO is appropriate for ioctls which only take
> an integer argument. I'll send a v3 with this fix, although I might
> wait a bit for any other review comments before doing so. Thanks for
> taking a look!

If there are no other command codes, you could also set .compat_ioctl
to the same function pointer as .unlocked_ioctl, the compat_ptr_ioctl
conversion is only needed when there are commands that take a pointer.

        Armd