ceph: turn ceph_security_invalidate_secctx into static inline

No need to do an extra jump here. Also add some comments on the endifs.
Signed-off-by: NJeff Layton <jlayton@kernel.org>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>

fs/ceph/super.h

@@ -16,6 +16,7 @@
 #include <linux/slab.h>
 #include <linux/posix_acl.h>
 #include <linux/refcount.h>
+#include <linux/security.h>
 
 #include <linux/ceph/libceph.h>
 
@@ -971,7 +972,10 @@ static inline bool ceph_security_xattr_wanted(struct inode *in)
 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
 extern int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
 				     struct ceph_acl_sec_ctx *ctx);
-extern void ceph_security_invalidate_secctx(struct inode *inode);
+static inline void ceph_security_invalidate_secctx(struct inode *inode)
+{
+	security_inode_invalidate_secctx(inode);
+}
 #else
 static inline int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
 					    struct ceph_acl_sec_ctx *ctx)

fs/ceph/xattr.c

@@ -1265,11 +1265,6 @@ int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
 	return err;
 }
 
-void ceph_security_invalidate_secctx(struct inode *inode)
-{
-	security_inode_invalidate_secctx(inode);
-}
-
 static int ceph_xattr_set_security_label(const struct xattr_handler *handler,
 				    struct dentry *unused, struct inode *inode,
 				    const char *key, const void *buf,
@@ -1298,8 +1293,8 @@ static const struct xattr_handler ceph_security_label_handler = {
 	.get    = ceph_xattr_get_security_label,
 	.set    = ceph_xattr_set_security_label,
 };
-#endif
-#endif
+#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */
+#endif /* CONFIG_SECURITY */
 
 void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
 {