Re: [PATCH 2/4] aio: Remove the now superfluous sentinel elements from ctl_table array

On Tue, Nov 07, 2023 at 02:44:21PM +0100, Joel Granados via B4 Relay wrote:
> From: Joel Granados <[email protected]>
> 
> This commit comes at the tail end of a greater effort to remove the
> empty elements at the end of the ctl_table arrays (sentinels) which
> will reduce the overall build time size of the kernel and run time
> memory bloat by ~64 bytes per sentinel (further information Link :
> https://lore.kernel.org/all/ZO5Yx5JFogGi%[email protected]/)
> 
> Remove sentinel elements ctl_table struct. Special attention was placed in
> making sure that an empty directory for fs/verity was created when
> CONFIG_FS_VERITY_BUILTIN_SIGNATURES is not defined. In this case we use the
> register sysctl call that expects a size.
> 
> Signed-off-by: Joel Granados <[email protected]>
> ---
>  fs/aio.c                           | 1 -
>  fs/coredump.c                      | 1 -
>  fs/dcache.c                        | 1 -
>  fs/devpts/inode.c                  | 1 -
>  fs/eventpoll.c                     | 1 -
>  fs/exec.c                          | 1 -
>  fs/file_table.c                    | 1 -
>  fs/inode.c                         | 1 -
>  fs/lockd/svc.c                     | 1 -
>  fs/locks.c                         | 1 -
>  fs/namei.c                         | 1 -
>  fs/namespace.c                     | 1 -
>  fs/nfs/nfs4sysctl.c                | 1 -
>  fs/nfs/sysctl.c                    | 1 -
>  fs/notify/dnotify/dnotify.c        | 1 -
>  fs/notify/fanotify/fanotify_user.c | 1 -
>  fs/notify/inotify/inotify_user.c   | 1 -
>  fs/ntfs/sysctl.c                   | 1 -
>  fs/ocfs2/stackglue.c               | 1 -
>  fs/pipe.c                          | 1 -
>  fs/proc/proc_sysctl.c              | 1 -
>  fs/quota/dquot.c                   | 1 -
>  fs/sysctls.c                       | 1 -
>  fs/userfaultfd.c                   | 1 -
>  fs/verity/fsverity_private.h       | 2 +-
>  fs/verity/init.c                   | 8 +++++---
>  fs/xfs/xfs_sysctl.c                | 2 --

Not sure why an xfs change came in on a patch tagged "aio:"; I would
have expected "fs:" or "vfs:" or something.  For the XFS part:

Reviewed-by: Darrick J. Wong <[email protected]>

--D

>  27 files changed, 6 insertions(+), 30 deletions(-)
> 
> diff --git a/fs/aio.c b/fs/aio.c
> index a4c2a6bac72c..da069d6b6c66 100644
> --- a/fs/aio.c
> +++ b/fs/aio.c
> @@ -239,7 +239,6 @@ static struct ctl_table aio_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_doulongvec_minmax,
>  	},
> -	{}
>  };
>  
>  static void __init aio_sysctl_init(void)
> diff --git a/fs/coredump.c b/fs/coredump.c
> index 9d235fa14ab9..f258c17c1841 100644
> --- a/fs/coredump.c
> +++ b/fs/coredump.c
> @@ -981,7 +981,6 @@ static struct ctl_table coredump_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_dointvec,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_coredump_sysctls(void)
> diff --git a/fs/dcache.c b/fs/dcache.c
> index 25ac74d30bff..bafdd455b0fe 100644
> --- a/fs/dcache.c
> +++ b/fs/dcache.c
> @@ -191,7 +191,6 @@ static struct ctl_table fs_dcache_sysctls[] = {
>  		.mode		= 0444,
>  		.proc_handler	= proc_nr_dentry,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_dcache_sysctls(void)
> diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
> index 299c295a27a0..a4de1612b1db 100644
> --- a/fs/devpts/inode.c
> +++ b/fs/devpts/inode.c
> @@ -69,7 +69,6 @@ static struct ctl_table pty_table[] = {
>  		.data		= &pty_count,
>  		.proc_handler	= proc_dointvec,
>  	},
> -	{}
>  };
>  
>  struct pts_mount_opts {
> diff --git a/fs/eventpoll.c b/fs/eventpoll.c
> index 1d9a71a0c4c1..975fc5623102 100644
> --- a/fs/eventpoll.c
> +++ b/fs/eventpoll.c
> @@ -322,7 +322,6 @@ static struct ctl_table epoll_table[] = {
>  		.extra1		= &long_zero,
>  		.extra2		= &long_max,
>  	},
> -	{ }
>  };
>  
>  static void __init epoll_sysctls_init(void)
> diff --git a/fs/exec.c b/fs/exec.c
> index 6518e33ea813..7a18bde22f25 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -2167,7 +2167,6 @@ static struct ctl_table fs_exec_sysctls[] = {
>  		.extra1		= SYSCTL_ZERO,
>  		.extra2		= SYSCTL_TWO,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_exec_sysctls(void)
> diff --git a/fs/file_table.c b/fs/file_table.c
> index ee21b3da9d08..544f7d4f166f 100644
> --- a/fs/file_table.c
> +++ b/fs/file_table.c
> @@ -137,7 +137,6 @@ static struct ctl_table fs_stat_sysctls[] = {
>  		.extra1		= &sysctl_nr_open_min,
>  		.extra2		= &sysctl_nr_open_max,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_stat_sysctls(void)
> diff --git a/fs/inode.c b/fs/inode.c
> index 35fd688168c5..ce16e3cda7bf 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -129,7 +129,6 @@ static struct ctl_table inodes_sysctls[] = {
>  		.mode		= 0444,
>  		.proc_handler	= proc_nr_inodes,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_inode_sysctls(void)
> diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
> index 6579948070a4..f784ff58bfd3 100644
> --- a/fs/lockd/svc.c
> +++ b/fs/lockd/svc.c
> @@ -474,7 +474,6 @@ static struct ctl_table nlm_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_dointvec,
>  	},
> -	{ }
>  };
>  
>  #endif	/* CONFIG_SYSCTL */
> diff --git a/fs/locks.c b/fs/locks.c
> index 76ad05f8070a..6ecfc422fb37 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -111,7 +111,6 @@ static struct ctl_table locks_sysctls[] = {
>  		.proc_handler	= proc_dointvec,
>  	},
>  #endif /* CONFIG_MMU */
> -	{}
>  };
>  
>  static int __init init_fs_locks_sysctls(void)
> diff --git a/fs/namei.c b/fs/namei.c
> index 567ee547492b..fb552161c981 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -1070,7 +1070,6 @@ static struct ctl_table namei_sysctls[] = {
>  		.extra1		= SYSCTL_ZERO,
>  		.extra2		= SYSCTL_TWO,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_namei_sysctls(void)
> diff --git a/fs/namespace.c b/fs/namespace.c
> index e157efc54023..e95d4328539d 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -5008,7 +5008,6 @@ static struct ctl_table fs_namespace_sysctls[] = {
>  		.proc_handler	= proc_dointvec_minmax,
>  		.extra1		= SYSCTL_ONE,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_namespace_sysctls(void)
> diff --git a/fs/nfs/nfs4sysctl.c b/fs/nfs/nfs4sysctl.c
> index e776200e9a11..886a7c4c60b3 100644
> --- a/fs/nfs/nfs4sysctl.c
> +++ b/fs/nfs/nfs4sysctl.c
> @@ -34,7 +34,6 @@ static struct ctl_table nfs4_cb_sysctls[] = {
>  		.mode = 0644,
>  		.proc_handler = proc_dointvec,
>  	},
> -	{ }
>  };
>  
>  int nfs4_register_sysctl(void)
> diff --git a/fs/nfs/sysctl.c b/fs/nfs/sysctl.c
> index f39e2089bc4c..e645be1a3381 100644
> --- a/fs/nfs/sysctl.c
> +++ b/fs/nfs/sysctl.c
> @@ -29,7 +29,6 @@ static struct ctl_table nfs_cb_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_dointvec,
>  	},
> -	{ }
>  };
>  
>  int nfs_register_sysctl(void)
> diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
> index ebdcc25df0f7..8151ed5ddefc 100644
> --- a/fs/notify/dnotify/dnotify.c
> +++ b/fs/notify/dnotify/dnotify.c
> @@ -29,7 +29,6 @@ static struct ctl_table dnotify_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_dointvec,
>  	},
> -	{}
>  };
>  static void __init dnotify_sysctl_init(void)
>  {
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index f69c451018e3..80539839af0c 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -86,7 +86,6 @@ static struct ctl_table fanotify_table[] = {
>  		.proc_handler	= proc_dointvec_minmax,
>  		.extra1		= SYSCTL_ZERO
>  	},
> -	{ }
>  };
>  
>  static void __init fanotify_sysctls_init(void)
> diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
> index 1c4bfdab008d..3e222a271da6 100644
> --- a/fs/notify/inotify/inotify_user.c
> +++ b/fs/notify/inotify/inotify_user.c
> @@ -85,7 +85,6 @@ static struct ctl_table inotify_table[] = {
>  		.proc_handler	= proc_dointvec_minmax,
>  		.extra1		= SYSCTL_ZERO
>  	},
> -	{ }
>  };
>  
>  static void __init inotify_sysctls_init(void)
> diff --git a/fs/ntfs/sysctl.c b/fs/ntfs/sysctl.c
> index 174fe536a1c0..4e980170d86a 100644
> --- a/fs/ntfs/sysctl.c
> +++ b/fs/ntfs/sysctl.c
> @@ -28,7 +28,6 @@ static struct ctl_table ntfs_sysctls[] = {
>  		.mode		= 0644,			/* Mode, proc handler. */
>  		.proc_handler	= proc_dointvec
>  	},
> -	{}
>  };
>  
>  /* Storage for the sysctls header. */
> diff --git a/fs/ocfs2/stackglue.c b/fs/ocfs2/stackglue.c
> index a8d5ca98fa57..20aa37b67cfb 100644
> --- a/fs/ocfs2/stackglue.c
> +++ b/fs/ocfs2/stackglue.c
> @@ -658,7 +658,6 @@ static struct ctl_table ocfs2_nm_table[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_dostring,
>  	},
> -	{ }
>  };
>  
>  static struct ctl_table_header *ocfs2_table_header;
> diff --git a/fs/pipe.c b/fs/pipe.c
> index 6c1a9b1db907..6bc1c4ae81d5 100644
> --- a/fs/pipe.c
> +++ b/fs/pipe.c
> @@ -1492,7 +1492,6 @@ static struct ctl_table fs_pipe_sysctls[] = {
>  		.mode		= 0644,
>  		.proc_handler	= proc_doulongvec_minmax,
>  	},
> -	{ }
>  };
>  #endif
>  
> diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
> index de484195f49f..4e06c4d69906 100644
> --- a/fs/proc/proc_sysctl.c
> +++ b/fs/proc/proc_sysctl.c
> @@ -71,7 +71,6 @@ static struct ctl_table root_table[] = {
>  		.procname = "",
>  		.mode = S_IFDIR|S_IRUGO|S_IXUGO,
>  	},
> -	{ }
>  };
>  static struct ctl_table_root sysctl_table_root = {
>  	.default_set.dir.header = {
> diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
> index 9e72bfe8bbad..69b03e13e6f2 100644
> --- a/fs/quota/dquot.c
> +++ b/fs/quota/dquot.c
> @@ -2949,7 +2949,6 @@ static struct ctl_table fs_dqstats_table[] = {
>  		.proc_handler	= proc_dointvec,
>  	},
>  #endif
> -	{ },
>  };
>  
>  static int __init dquot_init(void)
> diff --git a/fs/sysctls.c b/fs/sysctls.c
> index 76a0aee8c229..8dbde9a802fa 100644
> --- a/fs/sysctls.c
> +++ b/fs/sysctls.c
> @@ -26,7 +26,6 @@ static struct ctl_table fs_shared_sysctls[] = {
>  		.extra1		= SYSCTL_ZERO,
>  		.extra2		= SYSCTL_MAXOLDUID,
>  	},
> -	{ }
>  };
>  
>  static int __init init_fs_sysctls(void)
> diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
> index 56eaae9dac1a..7668285779c1 100644
> --- a/fs/userfaultfd.c
> +++ b/fs/userfaultfd.c
> @@ -45,7 +45,6 @@ static struct ctl_table vm_userfaultfd_table[] = {
>  		.extra1		= SYSCTL_ZERO,
>  		.extra2		= SYSCTL_ONE,
>  	},
> -	{ }
>  };
>  #endif
>  
> diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h
> index d071a6e32581..8191bf7ad706 100644
> --- a/fs/verity/fsverity_private.h
> +++ b/fs/verity/fsverity_private.h
> @@ -122,8 +122,8 @@ void __init fsverity_init_info_cache(void);
>  
>  /* signature.c */
>  
> -#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
>  extern int fsverity_require_signatures;
> +#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
>  int fsverity_verify_signature(const struct fsverity_info *vi,
>  			      const u8 *signature, size_t sig_size);
>  
> diff --git a/fs/verity/init.c b/fs/verity/init.c
> index a29f062f6047..e31045dd4f6c 100644
> --- a/fs/verity/init.c
> +++ b/fs/verity/init.c
> @@ -13,7 +13,6 @@
>  static struct ctl_table_header *fsverity_sysctl_header;
>  
>  static struct ctl_table fsverity_sysctl_table[] = {
> -#ifdef CONFIG_FS_VERITY_BUILTIN_SIGNATURES
>  	{
>  		.procname       = "require_signatures",
>  		.data           = &fsverity_require_signatures,
> @@ -23,14 +22,17 @@ static struct ctl_table fsverity_sysctl_table[] = {
>  		.extra1         = SYSCTL_ZERO,
>  		.extra2         = SYSCTL_ONE,
>  	},
> -#endif
> -	{ }
>  };
>  
>  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");
>  }
> diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c
> index fade33735393..a191f6560f98 100644
> --- a/fs/xfs/xfs_sysctl.c
> +++ b/fs/xfs/xfs_sysctl.c
> @@ -206,8 +206,6 @@ static struct ctl_table xfs_table[] = {
>  		.extra2		= &xfs_params.stats_clear.max
>  	},
>  #endif /* CONFIG_PROC_FS */
> -
> -	{}
>  };
>  
>  int
> 
> -- 
> 2.30.2
> 

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