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

From: Joel Granados
Date: Wed Nov 08 2023 - 03:28:41 EST

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On Tue, Nov 07, 2023 at 08:22:51AM -0800, Darrick J. Wong wrote:
> On Tue, Nov 07, 2023 at 02:44:21PM +0100, Joel Granados via B4 Relay wrote:
> > From: Joel Granados <j.granados@xxxxxxxxxxx>
> >
> > 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%2FcBo@xxxxxxxxxxxxxxxxxxxxxx/)
> >
> > 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 <j.granados@xxxxxxxxxxx>
> > ---
> > 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:
This was the same comment as Eric. will address it in my V2 and add your
reviewed tag.

Thx

>
> Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
>
> --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
> >

--

Joel Granados

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