__vcalloc
slot->arch.gfn_write_track = __vcalloc(npages, size,
slot->arch.rmap[i] = __vcalloc(lpages, sz, GFP_KERNEL_ACCOUNT);
linfo = __vcalloc(lpages, sizeof(*linfo), GFP_KERNEL_ACCOUNT);
memslot->dirty_bitmap = __vcalloc(2, dirty_bytes, GFP_KERNEL_ACCOUNT);