From 804c72eeecd2cd38567b64f868cc8c63202cf1a2 Mon Sep 17 00:00:00 2001 From: Matthieu Baerts Date: Thu, 27 May 2021 16:54:29 -0700 Subject: [PATCH] mptcp: support SYSCTL only if enabled Since the introduction of the sysctl support in MPTCP with commit 784325e9f037 ("mptcp: new sysctl to control the activation per NS"), we don't check CONFIG_SYSCTL. Until now, that was not an issue: the register and unregister functions were replaced by NO-OP one if SYSCTL was not enabled in the config. The only thing we could have avoid is not to reserve memory for the table but that's for the moment only a small table per net-ns. But the following commit is going to use SYSCTL_ZERO and SYSCTL_ONE which are not be defined if SYSCTL is not enabled in the config. This causes 'undefined reference' errors from the linker. Reported-by: kernel test robot Signed-off-by: Matthieu Baerts Signed-off-by: Mat Martineau Signed-off-by: Jakub Kicinski --- net/mptcp/ctrl.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c index 96ba616f59bfe..a3b15ed60b77c 100644 --- a/net/mptcp/ctrl.c +++ b/net/mptcp/ctrl.c @@ -4,7 +4,9 @@ * Copyright (c) 2019, Tessares SA. */ +#ifdef CONFIG_SYSCTL #include +#endif #include #include @@ -15,7 +17,9 @@ static int mptcp_pernet_id; struct mptcp_pernet { +#ifdef CONFIG_SYSCTL struct ctl_table_header *ctl_table_hdr; +#endif int mptcp_enabled; unsigned int add_addr_timeout; @@ -36,6 +40,13 @@ unsigned int mptcp_get_add_addr_timeout(struct net *net) return mptcp_get_pernet(net)->add_addr_timeout; } +static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) +{ + pernet->mptcp_enabled = 1; + pernet->add_addr_timeout = TCP_RTO_MAX; +} + +#ifdef CONFIG_SYSCTL static struct ctl_table mptcp_sysctl_table[] = { { .procname = "enabled", @@ -55,12 +66,6 @@ static struct ctl_table mptcp_sysctl_table[] = { {} }; -static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) -{ - pernet->mptcp_enabled = 1; - pernet->add_addr_timeout = TCP_RTO_MAX; -} - static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) { struct ctl_table_header *hdr; @@ -100,6 +105,17 @@ static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) kfree(table); } +#else + +static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet) +{ + return 0; +} + +static void mptcp_pernet_del_table(struct mptcp_pernet *pernet) {} + +#endif /* CONFIG_SYSCTL */ + static int __net_init mptcp_net_init(struct net *net) { struct mptcp_pernet *pernet = mptcp_get_pernet(net); -- 2.30.2