ginkgo supports only int32 indices on GPU

src/hyteg/ginkgo/GinkgoCGSolver.hpp

@@ -275,7 +275,7 @@ class GinkgoCGSolver : public Solver< OperatorType >
    using valueType    = typename FunctionType::valueType;
 
    using mtx   = gko::distributed::Matrix< valueType, int32_t >;
-   using csr   = gko::matrix::Csr< valueType, gko::distributed::global_index_type >;
+   using csr   = gko::matrix::Csr< valueType, int32_t >;
    using vec   = gko::distributed::Vector< valueType >;
    using dense = gko::matrix::Dense< valueType >;