diff --git a/errors.toml b/errors.toml
index 5024fd17f59..9bfd4a79190 100644
--- a/errors.toml
+++ b/errors.toml
@@ -901,11 +901,6 @@ error = '''
 reset user timestamp failed, %s
 '''
 
-["PD:tso:ErrSyncMaxTS"]
-error = '''
-sync max ts failed, %s
-'''
-
 ["PD:tso:ErrUpdateTimestamp"]
 error = '''
 update timestamp failed, %s
diff --git a/pkg/errs/errno.go b/pkg/errs/errno.go
index edebfe9f9e9..e5c23cffde2 100644
--- a/pkg/errs/errno.go
+++ b/pkg/errs/errno.go
@@ -42,7 +42,6 @@ var (
 var (
 	ErrGetAllocator                     = errors.Normalize("get allocator failed, %s", errors.RFCCodeText("PD:tso:ErrGetAllocator"))
 	ErrGetLocalAllocator                = errors.Normalize("get local allocator failed, %s", errors.RFCCodeText("PD:tso:ErrGetLocalAllocator"))
-	ErrSyncMaxTS                        = errors.Normalize("sync max ts failed, %s", errors.RFCCodeText("PD:tso:ErrSyncMaxTS"))
 	ErrResetUserTimestamp               = errors.Normalize("reset user timestamp failed, %s", errors.RFCCodeText("PD:tso:ErrResetUserTimestamp"))
 	ErrGenerateTimestamp                = errors.Normalize("generate timestamp failed, %s", errors.RFCCodeText("PD:tso:ErrGenerateTimestamp"))
 	ErrUpdateTimestamp                  = errors.Normalize("update timestamp failed, %s", errors.RFCCodeText("PD:tso:ErrUpdateTimestamp"))
diff --git a/server/grpc_service.go b/server/grpc_service.go
index f2e5586673d..3aa07e841ff 100644
--- a/server/grpc_service.go
+++ b/server/grpc_service.go
@@ -2757,7 +2757,7 @@ func scatterRegions(cluster *cluster.RaftCluster, regionsID []uint64, group stri
 }
 
 // Deprecated
-func (s *GrpcServer) GetDCLocationInfo(ctx context.Context, _ *pdpb.GetDCLocationInfoRequest) (*pdpb.GetDCLocationInfoResponse, error) {
+func (*GrpcServer) GetDCLocationInfo(_ context.Context, _ *pdpb.GetDCLocationInfoRequest) (*pdpb.GetDCLocationInfoResponse, error) {
 	return &pdpb.GetDCLocationInfoResponse{
 		Header: wrapHeader(),
 	}, nil