netdevsim: make debug dirs' dentries static

The root directories of netdevsim should only be used by the core
to create per-device subdirectories, so limit their visibility to
the core file.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/netdev.c

@@ -41,6 +41,9 @@ struct nsim_vf_config {
 
 static u32 nsim_dev_id;
 
+static struct dentry *nsim_ddir;
+static struct dentry *nsim_sdev_ddir;
+
 static int nsim_num_vf(struct device *dev)
 {
 	struct netdevsim *ns = to_nsim(dev);
@@ -566,9 +569,6 @@ static struct rtnl_link_ops nsim_link_ops __read_mostly = {
 	.dellink	= nsim_dellink,
 };
 
-struct dentry *nsim_ddir;
-struct dentry *nsim_sdev_ddir;
-
 static int __init nsim_module_init(void)
 {
 	int err;

drivers/net/netdevsim/netdevsim.h

@@ -103,9 +103,6 @@ struct netdevsim {
 	struct nsim_ipsec ipsec;
 };
 
-extern struct dentry *nsim_ddir;
-extern struct dentry *nsim_sdev_ddir;
-
 #ifdef CONFIG_BPF_SYSCALL
 int nsim_bpf_init(struct netdevsim *ns);
 void nsim_bpf_uninit(struct netdevsim *ns);