mm/pgtable-generic.c:27:2: error: cannot take the address of an rvalue of type 'pgd_t'
mm/pgtable-generic.c:34:2: error: cannot take the address of an rvalue of type 'p4d_t'
mm/pgtable-generic.c:42:2: error: cannot take the address of an rvalue of type 'pud_t'
mm/pgtable-generic.c:54:2: error: cannot take the address of an rvalue of type 'pmd_t'