linux-kernel - Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements from ctl

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Message-ID: <20231109160831.GA1933@sol.localdomain>
Date:   Thu, 9 Nov 2023 08:08:31 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Joel Granados <j.granados@...sung.com>
Cc:     Luis Chamberlain <mcgrof@...nel.org>, willy@...radead.org,
        josh@...htriplett.org, Kees Cook <keescook@...omium.org>,
        David Howells <dhowells@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Benjamin LaHaise <bcrl@...ck.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jeff Layton <jlayton@...nel.org>, Neil Brown <neilb@...e.de>,
        Olga Kornievskaia <kolga@...app.com>,
        Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>,
        Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        Matthew Bobrowski <repnop@...gle.com>,
        Anton Altaparmakov <anton@...era.com>,
        Namjae Jeon <linkinjeon@...nel.org>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Iurii Zaikin <yzaikin@...gle.com>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
        linux-cachefs@...hat.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
        linux-mm@...ck.org, linux-nfs@...r.kernel.org,
        linux-ntfs-dev@...ts.sourceforge.net, ocfs2-devel@...ts.linux.dev,
        fsverity@...ts.linux.dev, linux-xfs@...r.kernel.org,
        codalist@...emann.coda.cs.cmu.edu
Subject: Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements
 from ctl_table array

On Thu, Nov 09, 2023 at 05:00:40PM +0100, Joel Granados wrote:
> > >  static void __init fsverity_init_sysctl(void)
> > >  {
> > > +#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> > >  	fsverity_sysctl_header = register_sysctl("fs/verity",
> > >  						 fsverity_sysctl_table);
> > > +#else
> > > +	fsverity_sysctl_header = register_sysctl_sz("fs/verity",
> > > +						 fsverity_sysctl_table, 0);
> > > +#endif
> > >  	if (!fsverity_sysctl_header)
> > >  		panic("fsverity sysctl registration failed");
> > 
> > This does not make sense, and it causes a build error when CONFIG_FS_VERITY=y
> > and CONFIG_FS_VERITY_BUILTIN_SIGNATURES=n.
> > 
> > I think all you need to do is delete the sentinel element, the same as
> > everywhere else.  I just tested it, and it works fine.
> I found the reason why I added the CONFIG_FS_VERITY_BUILTIN_SIGNATURES
> here: it is related to
> https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@kernel.org/
> where the directory is registered with an element only if
> CONFIG_FS_VERITY_BUILTIN_SIGNATURES is defined. I had forgotten, but I
> even asked for a clarification on the patch :).
> 
> I see that that patch made it to v6.6. So the solution is not to remove
> the CONFIG_FS_VERITY_BUILTIN_SIGNATURES, but for me to rebase on top of
> a more up to date base.
> 
> @Eric: Please get back to me if the patch in
> https://lore.kernel.org/all/20230705212743.42180-3-ebiggers@kernel.org/
> is no longer relevant.
> 
> Best.

Yes, that patch was merged in 6.6.  I don't think it really matters here though,
other than the fact that it moved the code to a different file.  I believe all
you need to do is remove the sentinel element, the same as anywhere else:

diff --git a/fs/verity/init.c b/fs/verity/init.c
index a29f062f6047b..b64a76b9ac362 100644
--- a/fs/verity/init.c
+++ b/fs/verity/init.c
@@ -24,7 +24,6 @@ static struct ctl_table fsverity_sysctl_table[] = {
 		.extra2         = SYSCTL_ONE,
 	},
 #endif
-	{ }
 };
 
 static void __init fsverity_init_sysctl(void)