Symbol: p4d_deref
arch/s390/include/asm/pgtable.h
1467
return (pud_t *) p4d_deref(p4d) + pud_index(address);
arch/s390/mm/vmem.c
384
vmem_free_pages(p4d_deref(p4dp_get(p4d)), CRST_ALLOC_ORDER, NULL);