Function malloc_elem_from_data

dpdk/lib/eal/common/malloc_elem.h:306–316

* Given a pointer to the start of a memory block returned by malloc, get * the actual malloc_elem header for that block. */

 * the actual malloc_elem header for that block.
 */
static inline struct malloc_elem *
malloc_elem_from_data(const void *data)
{
	if (data == NULL)
		return NULL;

	struct malloc_elem *elem = RTE_PTR_SUB(data, MALLOC_ELEM_HEADER_LEN);
	if (!malloc_elem_cookies_ok(elem))
		return NULL;
	return elem->state != ELEM_PAD ? elem:  RTE_PTR_SUB(elem, elem->pad);
}

/*
 * initialise a malloc_elem header