Function malloc_elem_hide_region

dpdk/lib/eal/common/malloc_elem.c:608–658

assume all checks were already done */

/* assume all checks were already done */
void
malloc_elem_hide_region(struct malloc_elem *elem, void *start, size_t len)
{
	struct malloc_elem *hide_start, *hide_end, *prev, *next;
	size_t len_before, len_after;

	hide_start = start;
	hide_end = RTE_PTR_ADD(start, len);

	prev = elem->prev;
	next = elem->next;

	/* we cannot do anything with non-adjacent elements */
	if (next && next_elem_is_adjacent(elem)) {
		len_after = RTE_PTR_DIFF(next, hide_end);
		if (len_after >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
			asan_clear_split_alloczone(hide_end);

			/* split after */
			split_elem(elem, hide_end);

			malloc_elem_free_list_insert(hide_end);
		} else if (len_after > 0) {
			RTE_LOG(ERR, EAL, "Unaligned element, heap is probably corrupt\n");
			return;
		}
	}

	/* we cannot do anything with non-adjacent elements */
	if (prev && prev_elem_is_adjacent(elem)) {
		len_before = RTE_PTR_DIFF(hide_start, elem);
		if (len_before >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
			asan_clear_split_alloczone(hide_start);

			/* split before */
			split_elem(elem, hide_start);

			prev = elem;
			elem = hide_start;

			malloc_elem_free_list_insert(prev);
		} else if (len_before > 0) {
			RTE_LOG(ERR, EAL, "Unaligned element, heap is probably corrupt\n");
			return;
		}
	}

	asan_clear_alloczone(elem);

	remove_elem(elem);
}

/*
 * attempt to resize a malloc_elem by expanding into any free space