When CONFIG_NFS_V4_1 is not enabled, "make C=2" emits this warning:

linux/fs/nfs/nfs4session.c:337:6: warning:
 symbol 'nfs41_set_target_slotid' was not declared. Should it be static?

Move nfs41_set_target_slotid() and nfs41_update_target_slotid() back
behind CONFIG_NFS_V4_1, since, in the final revision of this work,
they are used only in NFSv4.1 and later.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4session.c

@@ -310,6 +310,8 @@ void nfs41_wake_slot_table(struct nfs4_slot_table *tbl)
 	}
 }
 
+#if defined(CONFIG_NFS_V4_1)
+
 static void nfs41_set_max_slotid_locked(struct nfs4_slot_table *tbl,
 		u32 target_highest_slotid)
 {
@@ -420,8 +422,6 @@ void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
 	spin_unlock(&tbl->slot_tbl_lock);
 }
 
-#if defined(CONFIG_NFS_V4_1)
-
 static void nfs4_destroy_session_slot_tables(struct nfs4_session *session)
 {
 	nfs4_release_slot_table(&session->fc_slot_table);

fs/nfs/nfs4session.h

@@ -78,9 +78,6 @@ extern void nfs4_release_slot_table(struct nfs4_slot_table *tbl);
 extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl);
 extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);
 extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl);
-extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
-		struct nfs4_slot *slot,
-		struct nfs4_sequence_res *res);
 bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl,
 		struct nfs4_slot *slot);
 void nfs41_wake_slot_table(struct nfs4_slot_table *tbl);
@@ -93,6 +90,9 @@ static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl)
 #if defined(CONFIG_NFS_V4_1)
 extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
 		u32 target_highest_slotid);
+extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
+		struct nfs4_slot *slot,
+		struct nfs4_sequence_res *res);
 
 extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses);