mm: compaction: use COMPACT_CLUSTER_MAX in compaction.c

Always use COMPACT_CLUSTER_MAX here as we're doing the compaction.  Minor
improvements in readability.

Link: https://lkml.kernel.org/r/20220418141253.24298-7-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Charan Teja Kalla <charante@codeaurora.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Pintu Kumar <pintu@codeaurora.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/compaction.c

@@ -573,7 +573,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 		 * contention, to give chance to IRQs. Abort if fatal signal
 		 * pending.
 		 */
-		if (!(blockpfn % SWAP_CLUSTER_MAX)
+		if (!(blockpfn % COMPACT_CLUSTER_MAX)
 		    && compact_unlock_should_abort(&cc->zone->lock, flags,
 								&locked, cc))
 			break;
@@ -862,7 +862,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * contention, to give chance to IRQs. Abort completely if
 		 * a fatal signal is pending.
 		 */
-		if (!(low_pfn % SWAP_CLUSTER_MAX)) {
+		if (!(low_pfn % COMPACT_CLUSTER_MAX)) {
 			if (locked) {
 				unlock_page_lruvec_irqrestore(locked, flags);
 				locked = NULL;
@@ -1614,7 +1614,7 @@ static void isolate_freepages(struct compact_control *cc)
 		 * This can iterate a massively long zone without finding any
 		 * suitable migration targets, so periodically check resched.
 		 */
-		if (!(block_start_pfn % (SWAP_CLUSTER_MAX * pageblock_nr_pages)))
+		if (!(block_start_pfn % (COMPACT_CLUSTER_MAX * pageblock_nr_pages)))
 			cond_resched();
 
 		page = pageblock_pfn_to_page(block_start_pfn, block_end_pfn,
@@ -1921,7 +1921,7 @@ static isolate_migrate_t isolate_migratepages(struct compact_control *cc)
 		 * many pageblocks unsuitable, so periodically check if we
 		 * need to schedule.
 		 */
-		if (!(low_pfn % (SWAP_CLUSTER_MAX * pageblock_nr_pages)))
+		if (!(low_pfn % (COMPACT_CLUSTER_MAX * pageblock_nr_pages)))
 			cond_resched();
 
 		page = pageblock_pfn_to_page(block_start_pfn,