41  * When pages are shared by more than one mapping, a list of these
48 	struct hment	*hm_next;	/* next mapping of same page */
49 	struct hment	*hm_prev;	/* previous mapping of same page */
51 	pfn_t		hm_pfn;		/* mapping page frame number */
58  * Value returned by hment_walk() when dealing with a single mapping
95  * "mlist_lock" is a hashed mutex lock for protecting per-page mapping
219 		 * victimizing a mapping in a user htable.  in hment_alloc()
303  * Internal routine to add a full hment to a page_t mapping list
314 	 * Add the hment to the page's mapping list.  in hment_insert()
333  * Prepare a mapping list entry to the given page.
337  * - Adding the first mapping to a page_t as an embedded hment
338  * - Refaulting on an existing embedded mapping
339  * - Upgrading an embedded mapping when adding a 2nd mapping
340  * - Adding another mapping to a page_t that already has multiple mappings
343  * Due to competition with other threads that may be mapping/unmapping the
358 		 * The most common case is establishing the first mapping to a  in hment_prepare()
375 		 * If there is an embedded mapping, we may need to  in hment_prepare()
384 			 * If we are faulting on a pre-existing mapping  in hment_prepare()
396 			 * existing embedded mapping.  in hment_prepare()
410 			 * used it for the embedded mapping. In either case,  in hment_prepare()
442  * Record a mapping list entry for the htable/entry to the given page.
452 	 * The most common case is establishing the first mapping to a  in hment_assign()
472 	 * add the new hment to the mapping list  in hment_assign()
519  * Remove a mapping to a page from its mapping list. Must have
520  * the corresponding mapping list locked.
521  * Finds the mapping list entry with the given pte_t and
522  * unlinks it from the mapping list.
535 	 * Check if we have only one mapping embedded in the page_t.  in hment_remove()
566 	 * Remove the hment from the page's mapping list  in hment_remove()
683 	 * walk through all larger mapping sizes counting mappings  in hment_mapcnt()
749 		 * Search the mapping list for a usable mapping.  in hment_steal()
768 	 * Steal the mapping we found.  Note that hati_page_unmap() will  in hment_steal()