linux-kernel - Re: [PATCH v6 2/5] userfaultfd: add /dev/userfaultfd for fine grained access control

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Message-ID: <Yv3bRwh/M8WVkQBs@kroah.com>
Date:   Thu, 18 Aug 2022 08:25:11 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        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-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        linux-security-module@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v6 2/5] userfaultfd: add /dev/userfaultfd for fine
 grained access control

On Wed, Aug 17, 2022 at 02:47:25PM -0700, Axel Rasmussen wrote:
>  static int __init userfaultfd_init(void)
>  {
> +	WARN_ON(misc_register(&userfaultfd_misc));

Please no.

Spell this out and properly error out if there is an issue:
	int ret;

	ret = misc_register(&userfaultfd_misc);
	if (ret)
		return ret;

Handle issues properly, don't paper over them with WARN_ON().

thanks,

greg k-h