irq_alloc_matrix
vector_matrix = irq_alloc_matrix(NR_VECTORS, FIRST_EXTERNAL_VECTOR,
loongarch_avec.vector_matrix = irq_alloc_matrix(NR_VECTORS, 0, NR_VECTORS);
imsic->matrix = irq_alloc_matrix(global->nr_ids + 1,
struct irq_matrix *irq_alloc_matrix(unsigned int matrix_bits,