selinux: mark some global variables __ro_after_init

All of these are never modified outside initcalls, so they can be
__ro_after_init.
Signed-off-by: NOndrej Mosnacek <omosnace@redhat.com>
Signed-off-by: NPaul Moore <paul@paul-moore.com>

security/selinux/avc.c

@@ -118,11 +118,11 @@ void avc_set_cache_threshold(struct selinux_avc *avc,
 	avc->avc_cache_threshold = cache_threshold;
 }
 
-static struct avc_callback_node *avc_callbacks;
-static struct kmem_cache *avc_node_cachep;
-static struct kmem_cache *avc_xperms_data_cachep;
-static struct kmem_cache *avc_xperms_decision_cachep;
-static struct kmem_cache *avc_xperms_cachep;
+static struct avc_callback_node *avc_callbacks __ro_after_init;
+static struct kmem_cache *avc_node_cachep __ro_after_init;
+static struct kmem_cache *avc_xperms_data_cachep __ro_after_init;
+static struct kmem_cache *avc_xperms_decision_cachep __ro_after_init;
+static struct kmem_cache *avc_xperms_cachep __ro_after_init;
 
 static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
 {

security/selinux/netlink.c

@@ -19,7 +19,7 @@
 
 #include "security.h"
 
-static struct sock *selnl;
+static struct sock *selnl __ro_after_init;
 
 static int selnl_msglen(int msgtype)
 {

security/selinux/selinuxfs.c

@@ -2204,8 +2204,8 @@ static struct file_system_type sel_fs_type = {
 	.kill_sb	= sel_kill_sb,
 };
 
-static struct vfsmount *selinuxfs_mount;
-struct path selinux_null;
+static struct vfsmount *selinuxfs_mount __ro_after_init;
+struct path selinux_null __ro_after_init;
 
 static int __init init_sel_fs(void)
 {

security/selinux/ss/avtab.c

@@ -23,8 +23,8 @@
 #include "avtab.h"
 #include "policydb.h"
 
-static struct kmem_cache *avtab_node_cachep;
-static struct kmem_cache *avtab_xperms_cachep;
+static struct kmem_cache *avtab_node_cachep __ro_after_init;
+static struct kmem_cache *avtab_xperms_cachep __ro_after_init;
 
 /* Based on MurmurHash3, written by Austin Appleby and placed in the
  * public domain.

security/selinux/ss/ebitmap.c

@@ -26,7 +26,7 @@
 
 #define BITS_PER_U64	(sizeof(u64) * 8)
 
-static struct kmem_cache *ebitmap_node_cachep;
+static struct kmem_cache *ebitmap_node_cachep __ro_after_init;
 
 int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2)
 {

security/selinux/ss/hashtab.c

@@ -9,7 +9,7 @@
 #include <linux/errno.h>
 #include "hashtab.h"
 
-static struct kmem_cache *hashtab_node_cachep;
+static struct kmem_cache *hashtab_node_cachep __ro_after_init;
 
 /*
  * Here we simply round the number of elements up to the nearest power of two.