KFENCE_METADATA_SIZE
kfence_metadata_init = alloc_pages_exact(KFENCE_METADATA_SIZE,
memzero_explicit(kfence_metadata_init, KFENCE_METADATA_SIZE);
free_pages_exact((void *)kfence_metadata_init, KFENCE_METADATA_SIZE);
memblock_free_late(__pa(kfence_metadata_init), KFENCE_METADATA_SIZE);
kfence_metadata_init = memblock_alloc(KFENCE_METADATA_SIZE, PAGE_SIZE);
const unsigned long nr_pages_meta = KFENCE_METADATA_SIZE / PAGE_SIZE;