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Date: Thu, 3 Mar 2022 16:40:06 +0800
From: Dust Li <dust.li@...ux.alibaba.com>
To: Karsten Graul <kgraul@...ux.ibm.com>,
Tony Lu <tonylu@...ux.alibaba.com>, davem@...emloft.net,
kuba@...nel.org
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
linux-rdma@...r.kernel.org
Subject: [PATCH net-next v2] net/smc: fix compile warning for smc_sysctl
kernel test robot reports multiple warning for smc_sysctl:
In file included from net/smc/smc_sysctl.c:17:
>> net/smc/smc_sysctl.h:23:5: warning: no previous prototype \
for function 'smc_sysctl_init' [-Wmissing-prototypes]
int smc_sysctl_init(void)
^
and
>> WARNING: modpost: vmlinux.o(.text+0x12ced2d): Section mismatch \
in reference from the function smc_sysctl_exit() to the variable
.init.data:smc_sysctl_ops
The function smc_sysctl_exit() references
the variable __initdata smc_sysctl_ops.
This is often because smc_sysctl_exit lacks a __initdata
annotation or the annotation of smc_sysctl_ops is wrong.
and
net/smc/smc_sysctl.c: In function 'smc_sysctl_init_net':
net/smc/smc_sysctl.c:47:17: error: 'struct netns_smc' has no member named 'smc_hdr'
47 | net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
Since we don't need global sysctl initialization. To make things
clean and simple, remove the global pernet_operations and
smc_sysctl_{init|exit}. Call smc_sysctl_net_{init|exit} directly
from smc_net_{init|exit}.
Also initialized sysctl_autocorking_size if CONFIG_SYSCTL it not
set, this makes sure SMC autocorking is enabled by default if
CONFIG_SYSCTL is not set.
Fixes: 462791bbfa35 ("net/smc: add sysctl interface for SMC")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>
---
v2: 1. Removes pernet_operations and smc_sysctl_{init|exit}
2. Initialize sysctl_autocorking_size if CONFIG_SYSCTL not set
---
net/smc/Makefile | 3 ++-
net/smc/af_smc.c | 15 ++++++---------
net/smc/smc_sysctl.c | 19 ++-----------------
net/smc/smc_sysctl.h | 9 +++++----
4 files changed, 15 insertions(+), 31 deletions(-)
diff --git a/net/smc/Makefile b/net/smc/Makefile
index 640af9a39f9c..875efcd126a2 100644
--- a/net/smc/Makefile
+++ b/net/smc/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_SMC) += smc.o
obj-$(CONFIG_SMC_DIAG) += smc_diag.o
smc-y := af_smc.o smc_pnet.o smc_ib.o smc_clc.o smc_core.o smc_wr.o smc_llc.o
smc-y += smc_cdc.o smc_tx.o smc_rx.o smc_close.o smc_ism.o smc_netlink.o smc_stats.o
-smc-y += smc_tracepoint.o smc_sysctl.o
+smc-y += smc_tracepoint.o
+smc-$(CONFIG_SYSCTL) += smc_sysctl.o
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 6447607675fa..4ab17d35ca80 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -3173,11 +3173,17 @@ unsigned int smc_net_id;
static __net_init int smc_net_init(struct net *net)
{
+ int rc;
+
+ rc = smc_sysctl_net_init(net);
+ if (rc)
+ return rc;
return smc_pnet_net_init(net);
}
static void __net_exit smc_net_exit(struct net *net)
{
+ smc_sysctl_net_exit(net);
smc_pnet_net_exit(net);
}
@@ -3290,17 +3296,9 @@ static int __init smc_init(void)
goto out_sock;
}
- rc = smc_sysctl_init();
- if (rc) {
- pr_err("%s: sysctl_init fails with %d\n", __func__, rc);
- goto out_ulp;
- }
-
static_branch_enable(&tcp_have_smc);
return 0;
-out_ulp:
- tcp_unregister_ulp(&smc_ulp_ops);
out_sock:
sock_unregister(PF_SMC);
out_proto6:
@@ -3328,7 +3326,6 @@ static int __init smc_init(void)
static void __exit smc_exit(void)
{
static_branch_disable(&tcp_have_smc);
- smc_sysctl_exit();
tcp_unregister_ulp(&smc_ulp_ops);
sock_unregister(PF_SMC);
smc_core_exit();
diff --git a/net/smc/smc_sysctl.c b/net/smc/smc_sysctl.c
index 3b59876aaac9..c4a2ffb6deee 100644
--- a/net/smc/smc_sysctl.c
+++ b/net/smc/smc_sysctl.c
@@ -28,7 +28,7 @@ static struct ctl_table smc_table[] = {
{ }
};
-static __net_init int smc_sysctl_init_net(struct net *net)
+int smc_sysctl_net_init(struct net *net)
{
struct ctl_table *table;
@@ -59,22 +59,7 @@ static __net_init int smc_sysctl_init_net(struct net *net)
return -ENOMEM;
}
-static __net_exit void smc_sysctl_exit_net(struct net *net)
+void smc_sysctl_net_exit(struct net *net)
{
unregister_net_sysctl_table(net->smc.smc_hdr);
}
-
-static struct pernet_operations smc_sysctl_ops __net_initdata = {
- .init = smc_sysctl_init_net,
- .exit = smc_sysctl_exit_net,
-};
-
-int __init smc_sysctl_init(void)
-{
- return register_pernet_subsys(&smc_sysctl_ops);
-}
-
-void smc_sysctl_exit(void)
-{
- unregister_pernet_subsys(&smc_sysctl_ops);
-}
diff --git a/net/smc/smc_sysctl.h b/net/smc/smc_sysctl.h
index 49553ac236b6..66bd617e26ad 100644
--- a/net/smc/smc_sysctl.h
+++ b/net/smc/smc_sysctl.h
@@ -15,17 +15,18 @@
#ifdef CONFIG_SYSCTL
-int smc_sysctl_init(void);
-void smc_sysctl_exit(void);
+int smc_sysctl_net_init(struct net *net);
+void smc_sysctl_net_exit(struct net *net);
#else
-int smc_sysctl_init(void)
+static inline int smc_sysctl_net_init(struct net *net)
{
+ net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
return 0;
}
-void smc_sysctl_exit(void) { }
+static inline void smc_sysctl_net_exit(struct net *net) { }
#endif /* CONFIG_SYSCTL */
--
2.19.1.3.ge56e4f7
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