SUNRPC: Remove EXPORT_SYMBOL_GPL() from GSS mech switch

Clean up: Reduce the symbol table footprint for auth_rpcgss.ko by
removing exported symbols for functions that are no longer used
outside of auth_rpcgss.ko.

The remaining two EXPORTs in gss_mech_switch.c get documenting
comments.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/auth_gss/gss_mech_switch.c

@@ -103,8 +103,13 @@ gss_mech_svc_setup(struct gss_api_mech *gm)
 	return status;
 }
 
-int
-gss_mech_register(struct gss_api_mech *gm)
+/**
+ * gss_mech_register - register a GSS mechanism
+ * @gm: GSS mechanism handle
+ *
+ * Returns zero if successful, or a negative errno.
+ */
+int gss_mech_register(struct gss_api_mech *gm)
 {
 	int status;
 
@@ -117,19 +122,21 @@ gss_mech_register(struct gss_api_mech *gm)
 	dprintk("RPC:       registered gss mechanism %s\n", gm->gm_name);
 	return 0;
 }
-
 EXPORT_SYMBOL_GPL(gss_mech_register);
 
-void
-gss_mech_unregister(struct gss_api_mech *gm)
+/**
+ * gss_mech_unregister - release a GSS mechanism
+ * @gm: GSS mechanism handle
+ *
+ */
+void gss_mech_unregister(struct gss_api_mech *gm)
 {
 	spin_lock(&registered_mechs_lock);
 	list_del(&gm->gm_list);
 	spin_unlock(&registered_mechs_lock);
 	dprintk("RPC:       unregistered gss mechanism %s\n", gm->gm_name);
 	gss_mech_free(gm);
 }
-
 EXPORT_SYMBOL_GPL(gss_mech_unregister);
 
 static struct gss_api_mech *gss_mech_get(struct gss_api_mech *gm)
@@ -167,7 +174,6 @@ struct gss_api_mech * gss_mech_get_by_name(const char *name)
 	}
 	return gm;
 }
-EXPORT_SYMBOL_GPL(gss_mech_get_by_name);
 
 static struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
 {
@@ -355,8 +361,6 @@ gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
 	return 0;
 }
 
-EXPORT_SYMBOL_GPL(gss_pseudoflavor_to_service);
-
 char *
 gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
 {
@@ -369,17 +373,13 @@ gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
 	return NULL;
 }
 
-EXPORT_SYMBOL_GPL(gss_service_to_auth_domain_name);
-
 void
 gss_mech_put(struct gss_api_mech * gm)
 {
 	if (gm)
 		module_put(gm->gm_owner);
 }
 
-EXPORT_SYMBOL_GPL(gss_mech_put);
-
 /* The mech could probably be determined from the token instead, but it's just
  * as easy for now to pass it in. */
 int