825 isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,  in isolate_migratepages_block()  argument
834 	unsigned long start_pfn = low_pfn;  in isolate_migratepages_block()
863 		next_skip_pfn = block_end_pfn(low_pfn, cc->order);  in isolate_migratepages_block()
867 	for (; low_pfn < end_pfn; low_pfn++) {  in isolate_migratepages_block()
869 		if (skip_on_failure && low_pfn >= next_skip_pfn) {  in isolate_migratepages_block()
888 			next_skip_pfn = block_end_pfn(low_pfn, cc->order);  in isolate_migratepages_block()
896 		if (!(low_pfn % SWAP_CLUSTER_MAX)  in isolate_migratepages_block()
899 			low_pfn = 0;  in isolate_migratepages_block()
903 		if (!pfn_valid_within(low_pfn))  in isolate_migratepages_block()
907 		page = pfn_to_page(low_pfn);  in isolate_migratepages_block()
915 		if (!valid_page && IS_ALIGNED(low_pfn, pageblock_nr_pages)) {  in isolate_migratepages_block()
917 				low_pfn = end_pfn;  in isolate_migratepages_block()
938 				low_pfn += (1UL << freepage_order) - 1;  in isolate_migratepages_block()
954 				low_pfn += (1UL << order) - 1;  in isolate_migratepages_block()
1007 				if (test_and_set_skip(cc, page, low_pfn))  in isolate_migratepages_block()
1021 				low_pfn += compound_nr(page) - 1;  in isolate_migratepages_block()
1034 			low_pfn += compound_nr(page) - 1;  in isolate_migratepages_block()
1055 			++low_pfn;  in isolate_migratepages_block()
1079 		if (low_pfn < next_skip_pfn) {  in isolate_migratepages_block()
1080 			low_pfn = next_skip_pfn - 1;  in isolate_migratepages_block()
1093 	if (unlikely(low_pfn > end_pfn))  in isolate_migratepages_block()
1094 		low_pfn = end_pfn;  in isolate_migratepages_block()
1108 	if (low_pfn == end_pfn && (!nr_isolated || cc->rescan)) {  in isolate_migratepages_block()
1111 		update_cached_migrate(cc, low_pfn);  in isolate_migratepages_block()
1114 	trace_mm_compaction_isolate_migratepages(start_pfn, low_pfn,  in isolate_migratepages_block()
1122 	return low_pfn;  in isolate_migratepages_block()
1334 	unsigned long low_pfn, min_pfn, highest = 0;  in fast_isolate_freepages()  local
1359 	low_pfn = pageblock_start_pfn(cc->free_pfn - (distance >> 2));  in fast_isolate_freepages()
1362 	if (WARN_ON_ONCE(min_pfn > low_pfn))  in fast_isolate_freepages()
1363 		low_pfn = min_pfn;  in fast_isolate_freepages()
1397 			if (pfn >= low_pfn) {  in fast_isolate_freepages()
1483 	low_pfn = page_to_pfn(page);  in fast_isolate_freepages()
1484 	fast_isolate_around(cc, low_pfn, nr_isolated);  in fast_isolate_freepages()
1485 	return low_pfn;  in fast_isolate_freepages()
1499 	unsigned long low_pfn;	     /* lowest pfn scanner is able to scan */  in isolate_freepages()  local
1523 	low_pfn = pageblock_end_pfn(cc->migrate_pfn);  in isolate_freepages()
1531 	for (; block_start_pfn >= low_pfn;  in isolate_freepages()
1808 	unsigned long low_pfn;  in isolate_migratepages()  local
1820 	low_pfn = fast_find_migrateblock(cc);  in isolate_migratepages()
1821 	block_start_pfn = pageblock_start_pfn(low_pfn);  in isolate_migratepages()
1830 	fast_find_block = low_pfn != cc->migrate_pfn && !cc->fast_search_fail;  in isolate_migratepages()
1833 	block_end_pfn = pageblock_end_pfn(low_pfn);  in isolate_migratepages()
1841 			low_pfn = block_end_pfn,  in isolate_migratepages()
1850 		if (!(low_pfn % (SWAP_CLUSTER_MAX * pageblock_nr_pages)))  in isolate_migratepages()
1865 		if (IS_ALIGNED(low_pfn, pageblock_nr_pages) &&  in isolate_migratepages()
1883 		low_pfn = isolate_migratepages_block(cc, low_pfn,  in isolate_migratepages()
1886 		if (!low_pfn)  in isolate_migratepages()
1898 	cc->migrate_pfn = low_pfn;  in isolate_migratepages()