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Date: Fri, 3 May 2024 14:56:07 +0200
From: Joel Granados <j.granados@samsung.com>
To: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= <linux@weissschuh.net>
CC: David Ahern <dsahern@kernel.org>, "David S. Miller"
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	<linux-wpan@vger.kernel.org>, <mptcp@lists.linux.dev>,
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Subject: Re: [PATCH v2] sysctl: treewide: constify
 ctl_table_header::ctl_table_arg
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	<20240418-sysctl-const-table-arg-v2-1-4012abc31311@weissschuh.net>

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On Thu, Apr 18, 2024 at 11:40:08AM +0200, Thomas Wei=DFschuh wrote:
> To be able to constify instances of struct ctl_tables it is necessary to
> remove ways through which non-const versions are exposed from the
> sysctl core.
> One of these is the ctl_table_arg member of struct ctl_table_header.
>=20
> Constify this reference as a prerequisite for the full constification of
> struct ctl_table instances.
> No functional change.
>=20
> Signed-off-by: Thomas Wei=DFschuh <linux@weissschuh.net>
> ---
> Changes in v2:
> - Add link to original monolithic series
> - Send to all maintainers again
> - Link to v1: https://lore.kernel.org/r/20240322-sysctl-const-table-arg-v=
1-1-88436d34961b@weissschuh.net
> ---
> This is a standalone version of PATCH 11 from my original const-sysctl
> series at
> https://lore.kernel.org/lkml/20231204-const-sysctl-v2-0-7a5060b11447@weis=
sschuh.net/
>=20
> It is based upon the branch constfy of
> https://git.kernel.org/pub/scm/linux/kernel/git/sysctl/sysctl.git/
>=20
> This patch is meant to be applied through the sysctl tree.
>=20
> It was implemented by manually searching for "ctl_table_arg"
> throughout the tree and inspecing each found site.
>=20
> If somebody comes up with a cocciscript for this, I'll be happy to use
> that.
> ---
>  drivers/net/vrf.c                       | 2 +-
>  include/linux/sysctl.h                  | 2 +-
>  ipc/ipc_sysctl.c                        | 2 +-
>  ipc/mq_sysctl.c                         | 2 +-
>  kernel/ucount.c                         | 2 +-
>  net/ax25/sysctl_net_ax25.c              | 2 +-
>  net/bridge/br_netfilter_hooks.c         | 2 +-
>  net/core/sysctl_net_core.c              | 2 +-
>  net/ieee802154/6lowpan/reassembly.c     | 2 +-
>  net/ipv4/devinet.c                      | 2 +-
>  net/ipv4/ip_fragment.c                  | 2 +-
>  net/ipv4/route.c                        | 2 +-
>  net/ipv4/sysctl_net_ipv4.c              | 2 +-
>  net/ipv4/xfrm4_policy.c                 | 2 +-
>  net/ipv6/addrconf.c                     | 2 +-
>  net/ipv6/netfilter/nf_conntrack_reasm.c | 2 +-
>  net/ipv6/reassembly.c                   | 2 +-
>  net/ipv6/sysctl_net_ipv6.c              | 6 +++---
>  net/ipv6/xfrm6_policy.c                 | 2 +-
>  net/mpls/af_mpls.c                      | 4 ++--
>  net/mptcp/ctrl.c                        | 2 +-
>  net/netfilter/nf_conntrack_standalone.c | 2 +-
>  net/netfilter/nf_log.c                  | 2 +-
>  net/sctp/sysctl.c                       | 2 +-
>  net/smc/smc_sysctl.c                    | 2 +-
>  net/unix/sysctl_net_unix.c              | 2 +-
>  net/xfrm/xfrm_sysctl.c                  | 2 +-
>  27 files changed, 30 insertions(+), 30 deletions(-)
I see that Kees has reviewed this, but most of it falls in the network
subsystem. At this point I see three options:

1. I queue it all up in the sysctl changes going into 6.11 and it make
   its way to mainline that way.
2. Since its mostly network, it can all go through that path
3. We split this up into netwokring and non-networking changes and each
   takes its separate path.

I would like to hear from the network folks on these options.

Best
>=20
> diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
> index bb95ce43cd97..66f8542f3b18 100644
> --- a/drivers/net/vrf.c
> +++ b/drivers/net/vrf.c
> @@ -1971,7 +1971,7 @@ static int vrf_netns_init_sysctl(struct net *net, s=
truct netns_vrf *nn_vrf)
>  static void vrf_netns_exit_sysctl(struct net *net)
>  {
>  	struct netns_vrf *nn_vrf =3D net_generic(net, vrf_net_id);
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D nn_vrf->ctl_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(nn_vrf->ctl_hdr);
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index 47bd28ffa88f..09db2f2e6488 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -171,7 +171,7 @@ struct ctl_table_header {
>  		struct rcu_head rcu;
>  	};
>  	struct completion *unregistering;
> -	struct ctl_table *ctl_table_arg;
> +	const struct ctl_table *ctl_table_arg;
>  	struct ctl_table_root *root;
>  	struct ctl_table_set *set;
>  	struct ctl_dir *parent;
> diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
> index 19b2a67aef40..113452038303 100644
> --- a/ipc/ipc_sysctl.c
> +++ b/ipc/ipc_sysctl.c
> @@ -305,7 +305,7 @@ bool setup_ipc_sysctls(struct ipc_namespace *ns)
> =20
>  void retire_ipc_sysctls(struct ipc_namespace *ns)
>  {
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D ns->ipc_sysctls->ctl_table_arg;
>  	unregister_sysctl_table(ns->ipc_sysctls);
> diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c
> index 43c0825da9e8..068e7d5aa42b 100644
> --- a/ipc/mq_sysctl.c
> +++ b/ipc/mq_sysctl.c
> @@ -159,7 +159,7 @@ bool setup_mq_sysctls(struct ipc_namespace *ns)
> =20
>  void retire_mq_sysctls(struct ipc_namespace *ns)
>  {
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D ns->mq_sysctls->ctl_table_arg;
>  	unregister_sysctl_table(ns->mq_sysctls);
> diff --git a/kernel/ucount.c b/kernel/ucount.c
> index 90300840256b..366a2c1971f5 100644
> --- a/kernel/ucount.c
> +++ b/kernel/ucount.c
> @@ -119,7 +119,7 @@ bool setup_userns_sysctls(struct user_namespace *ns)
>  void retire_userns_sysctls(struct user_namespace *ns)
>  {
>  #ifdef CONFIG_SYSCTL
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D ns->sysctls->ctl_table_arg;
>  	unregister_sysctl_table(ns->sysctls);
> diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c
> index db66e11e7fe8..e0128dc9def3 100644
> --- a/net/ax25/sysctl_net_ax25.c
> +++ b/net/ax25/sysctl_net_ax25.c
> @@ -171,7 +171,7 @@ int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
>  void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev)
>  {
>  	struct ctl_table_header *header =3D ax25_dev->sysheader;
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	if (header) {
>  		ax25_dev->sysheader =3D NULL;
> diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_ho=
oks.c
> index 35e10c5a766d..a09118c56c7d 100644
> --- a/net/bridge/br_netfilter_hooks.c
> +++ b/net/bridge/br_netfilter_hooks.c
> @@ -1268,7 +1268,7 @@ static int br_netfilter_sysctl_init_net(struct net =
*net)
>  static void br_netfilter_sysctl_exit_net(struct net *net,
>  					 struct brnf_net *brnet)
>  {
> -	struct ctl_table *table =3D brnet->ctl_hdr->ctl_table_arg;
> +	const struct ctl_table *table =3D brnet->ctl_hdr->ctl_table_arg;
> =20
>  	unregister_net_sysctl_table(brnet->ctl_hdr);
>  	if (!net_eq(net, &init_net))
> diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
> index 6973dda3abda..903ab4a51c17 100644
> --- a/net/core/sysctl_net_core.c
> +++ b/net/core/sysctl_net_core.c
> @@ -743,7 +743,7 @@ static __net_init int sysctl_core_net_init(struct net=
 *net)
> =20
>  static __net_exit void sysctl_core_net_exit(struct net *net)
>  {
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D net->core.sysctl_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->core.sysctl_hdr);
> diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan=
/reassembly.c
> index 6dd960ec558c..2a983cf450da 100644
> --- a/net/ieee802154/6lowpan/reassembly.c
> +++ b/net/ieee802154/6lowpan/reassembly.c
> @@ -399,7 +399,7 @@ static int __net_init lowpan_frags_ns_sysctl_register=
(struct net *net)
> =20
>  static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
>  	struct netns_ieee802154_lowpan *ieee802154_lowpan =3D
>  		net_ieee802154_lowpan(net);
> =20
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index 7a437f0d4190..7592f242336b 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -2749,7 +2749,7 @@ static __net_init int devinet_init_net(struct net *=
net)
>  static __net_exit void devinet_exit_net(struct net *net)
>  {
>  #ifdef CONFIG_SYSCTL
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D net->ipv4.forw_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->ipv4.forw_hdr);
> diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
> index a4941f53b523..6b9285fd6f06 100644
> --- a/net/ipv4/ip_fragment.c
> +++ b/net/ipv4/ip_fragment.c
> @@ -632,7 +632,7 @@ static int __net_init ip4_frags_ns_ctl_register(struc=
t net *net)
> =20
>  static void __net_exit ip4_frags_ns_ctl_unregister(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->ipv4.frags_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->ipv4.frags_hdr);
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index c8f76f56dc16..af30b5942ba4 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -3590,7 +3590,7 @@ static __net_init int sysctl_route_net_init(struct =
net *net)
> =20
>  static __net_exit void sysctl_route_net_exit(struct net *net)
>  {
> -	struct ctl_table *tbl;
> +	const struct ctl_table *tbl;
> =20
>  	tbl =3D net->ipv4.route_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->ipv4.route_hdr);
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index 7e4f16a7dcc1..ce5d19978a26 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -1554,7 +1554,7 @@ static __net_init int ipv4_sysctl_init_net(struct n=
et *net)
> =20
>  static __net_exit void ipv4_sysctl_exit_net(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	kfree(net->ipv4.sysctl_local_reserved_ports);
>  	table =3D net->ipv4.ipv4_hdr->ctl_table_arg;
> diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
> index c33bca2c3841..1dda59e0aeab 100644
> --- a/net/ipv4/xfrm4_policy.c
> +++ b/net/ipv4/xfrm4_policy.c
> @@ -186,7 +186,7 @@ static __net_init int xfrm4_net_sysctl_init(struct ne=
t *net)
> =20
>  static __net_exit void xfrm4_net_sysctl_exit(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	if (!net->ipv4.xfrm4_hdr)
>  		return;
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 247bd4d8ee45..9c34a351f115 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -7235,7 +7235,7 @@ static int __addrconf_sysctl_register(struct net *n=
et, char *dev_name,
>  static void __addrconf_sysctl_unregister(struct net *net,
>  					 struct ipv6_devconf *p, int ifindex)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	if (!p->sysctl_header)
>  		return;
> diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter=
/nf_conntrack_reasm.c
> index 1a51a44571c3..98809f846229 100644
> --- a/net/ipv6/netfilter/nf_conntrack_reasm.c
> +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
> @@ -105,7 +105,7 @@ static int nf_ct_frag6_sysctl_register(struct net *ne=
t)
>  static void __net_exit nf_ct_frags6_sysctl_unregister(struct net *net)
>  {
>  	struct nft_ct_frag6_pernet *nf_frag =3D nf_frag_pernet(net);
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D nf_frag->nf_frag_frags_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(nf_frag->nf_frag_frags_hdr);
> diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
> index acb4f119e11f..ee95cdcc8747 100644
> --- a/net/ipv6/reassembly.c
> +++ b/net/ipv6/reassembly.c
> @@ -487,7 +487,7 @@ static int __net_init ip6_frags_ns_sysctl_register(st=
ruct net *net)
> =20
>  static void __net_exit ip6_frags_ns_sysctl_unregister(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->ipv6.sysctl.frags_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr);
> diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
> index 888676163e90..75de55f907b0 100644
> --- a/net/ipv6/sysctl_net_ipv6.c
> +++ b/net/ipv6/sysctl_net_ipv6.c
> @@ -313,9 +313,9 @@ static int __net_init ipv6_sysctl_net_init(struct net=
 *net)
> =20
>  static void __net_exit ipv6_sysctl_net_exit(struct net *net)
>  {
> -	struct ctl_table *ipv6_table;
> -	struct ctl_table *ipv6_route_table;
> -	struct ctl_table *ipv6_icmp_table;
> +	const struct ctl_table *ipv6_table;
> +	const struct ctl_table *ipv6_route_table;
> +	const struct ctl_table *ipv6_icmp_table;
> =20
>  	ipv6_table =3D net->ipv6.sysctl.hdr->ctl_table_arg;
>  	ipv6_route_table =3D net->ipv6.sysctl.route_hdr->ctl_table_arg;
> diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
> index 42fb6996b077..4891012b692f 100644
> --- a/net/ipv6/xfrm6_policy.c
> +++ b/net/ipv6/xfrm6_policy.c
> @@ -218,7 +218,7 @@ static int __net_init xfrm6_net_sysctl_init(struct ne=
t *net)
> =20
>  static void __net_exit xfrm6_net_sysctl_exit(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	if (!net->ipv6.sysctl.xfrm6_hdr)
>  		return;
> diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> index 6dab883a08dd..973881b8faa3 100644
> --- a/net/mpls/af_mpls.c
> +++ b/net/mpls/af_mpls.c
> @@ -1438,7 +1438,7 @@ static void mpls_dev_sysctl_unregister(struct net_d=
evice *dev,
>  				       struct mpls_dev *mdev)
>  {
>  	struct net *net =3D dev_net(dev);
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	if (!mdev->sysctl)
>  		return;
> @@ -2706,7 +2706,7 @@ static void mpls_net_exit(struct net *net)
>  {
>  	struct mpls_route __rcu **platform_label;
>  	size_t platform_labels;
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
>  	unsigned int index;
> =20
>  	table =3D net->mpls.ctl->ctl_table_arg;
> diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
> index 13fe0748dde8..8d661156ab8c 100644
> --- a/net/mptcp/ctrl.c
> +++ b/net/mptcp/ctrl.c
> @@ -198,7 +198,7 @@ static int mptcp_pernet_new_table(struct net *net, st=
ruct mptcp_pernet *pernet)
> =20
>  static void mptcp_pernet_del_table(struct mptcp_pernet *pernet)
>  {
> -	struct ctl_table *table =3D pernet->ctl_table_hdr->ctl_table_arg;
> +	const struct ctl_table *table =3D pernet->ctl_table_hdr->ctl_table_arg;
> =20
>  	unregister_net_sysctl_table(pernet->ctl_table_hdr);
> =20
> diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_c=
onntrack_standalone.c
> index 0ee98ce5b816..bb9dea676ec1 100644
> --- a/net/netfilter/nf_conntrack_standalone.c
> +++ b/net/netfilter/nf_conntrack_standalone.c
> @@ -1122,7 +1122,7 @@ static int nf_conntrack_standalone_init_sysctl(stru=
ct net *net)
>  static void nf_conntrack_standalone_fini_sysctl(struct net *net)
>  {
>  	struct nf_conntrack_net *cnet =3D nf_ct_pernet(net);
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D cnet->sysctl_header->ctl_table_arg;
>  	unregister_net_sysctl_table(cnet->sysctl_header);
> diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
> index 370f8231385c..efedd2f13ac7 100644
> --- a/net/netfilter/nf_log.c
> +++ b/net/netfilter/nf_log.c
> @@ -514,7 +514,7 @@ static int netfilter_log_sysctl_init(struct net *net)
> =20
>  static void netfilter_log_sysctl_exit(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->nf.nf_log_dir_header->ctl_table_arg;
>  	unregister_net_sysctl_table(net->nf.nf_log_dir_header);
> diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
> index f65d6f92afcb..25bdf17c7262 100644
> --- a/net/sctp/sysctl.c
> +++ b/net/sctp/sysctl.c
> @@ -624,7 +624,7 @@ int sctp_sysctl_net_register(struct net *net)
> =20
>  void sctp_sysctl_net_unregister(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->sctp.sysctl_header->ctl_table_arg;
>  	unregister_net_sysctl_table(net->sctp.sysctl_header);
> diff --git a/net/smc/smc_sysctl.c b/net/smc/smc_sysctl.c
> index a5946d1b9d60..4e8baa2e7ea4 100644
> --- a/net/smc/smc_sysctl.c
> +++ b/net/smc/smc_sysctl.c
> @@ -133,7 +133,7 @@ int __net_init smc_sysctl_net_init(struct net *net)
> =20
>  void __net_exit smc_sysctl_net_exit(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->smc.smc_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->smc.smc_hdr);
> diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
> index 3e84b31c355a..44996af61999 100644
> --- a/net/unix/sysctl_net_unix.c
> +++ b/net/unix/sysctl_net_unix.c
> @@ -52,7 +52,7 @@ int __net_init unix_sysctl_register(struct net *net)
> =20
>  void unix_sysctl_unregister(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->unx.ctl->ctl_table_arg;
>  	unregister_net_sysctl_table(net->unx.ctl);
> diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c
> index 7fdeafc838a7..e972930c292b 100644
> --- a/net/xfrm/xfrm_sysctl.c
> +++ b/net/xfrm/xfrm_sysctl.c
> @@ -76,7 +76,7 @@ int __net_init xfrm_sysctl_init(struct net *net)
> =20
>  void __net_exit xfrm_sysctl_fini(struct net *net)
>  {
> -	struct ctl_table *table;
> +	const struct ctl_table *table;
> =20
>  	table =3D net->xfrm.sysctl_hdr->ctl_table_arg;
>  	unregister_net_sysctl_table(net->xfrm.sysctl_hdr);
>=20
> ---
> base-commit: 48a8b5270db856be233021e47a5f1dc02d47ed0d
> change-id: 20231226-sysctl-const-table-arg-2c828e0264dc
>=20
> Best regards,
> --=20
> Thomas Wei=DFschuh <linux@weissschuh.net>
>=20

--=20

Joel Granados

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