mm/page_isolation: remove migratetype from undo_isolate_page_range()

Since migratetype is no longer overwritten during pageblock isolation,
undoing pageblock isolation no longer needs which migratetype to restore.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zi Yan <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Reviewed-by: Vlastimil Babka <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Brendan Jackman <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kirill A. Shuemov <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: Richard Chang <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

4 files changed, 7 insertions, 11 deletions

diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
index 7241a6719618..7a681a49e73c 100644
--- a/include/linux/page-isolation.h
+++ b/include/linux/page-isolation.h
@@ -51,8 +51,7 @@ bool pageblock_unisolate_and_move_free_pages(struct zone *zone, struct page *pag
 int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 			     int migratetype, int flags);
 
-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			     int migratetype);
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn);
 
 int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
 			int isol_flags);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a3c2b0784070..6e3380ad1bf5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1222,7 +1222,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages,
 		build_all_zonelists(NULL);
 
 	/* Basic onlining is complete, allow allocation of onlined pages. */
-	undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE);
+	undo_isolate_page_range(pfn, pfn + nr_pages);
 
 	/*
 	 * Freshly onlined pages aren't shuffled (e.g., all pages are placed to
@@ -2086,7 +2086,7 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
 
 failed_removal_isolated:
 	/* pushback to free area */
-	undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
+	undo_isolate_page_range(start_pfn, end_pfn);
 	memory_notify(MEM_CANCEL_OFFLINE, &mem_arg);
 	if (node_arg.nid != NUMA_NO_NODE)
 		node_notify(NODE_CANCEL_REMOVING_LAST_MEMORY, &node_arg);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 938b01bed1f6..8d4b3f12b9a6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6984,7 +6984,7 @@ int alloc_contig_range_noprof(unsigned long start, unsigned long end,
 		     start, end, outer_start, outer_end);
 	}
 done:
-	undo_isolate_page_range(start, end, migratetype);
+	undo_isolate_page_range(start, end);
 	return ret;
 }
 EXPORT_SYMBOL(alloc_contig_range_noprof);
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 08f627a5032f..1edfef408faf 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -515,7 +515,7 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
 		page = __first_valid_page(pfn, pageblock_nr_pages);
 		if (page && set_migratetype_isolate(page, migratetype, flags,
 					start_pfn, end_pfn)) {
-			undo_isolate_page_range(isolate_start, pfn, migratetype);
+			undo_isolate_page_range(isolate_start, pfn);
 			unset_migratetype_isolate(
 				pfn_to_page(isolate_end - pageblock_nr_pages));
 			return -EBUSY;
@@ -528,13 +528,10 @@ int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
  * undo_isolate_page_range - undo effects of start_isolate_page_range()
  * @start_pfn:		The first PFN of the isolated range
  * @end_pfn:		The last PFN of the isolated range
- * @migratetype:	New migrate type to set on the range
  *
- * This finds every MIGRATE_ISOLATE page block in the given range
- * and switches it to @migratetype.
+ * This finds and unsets every MIGRATE_ISOLATE page block in the given range
  */
-void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
-			    int migratetype)
+void undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn)
 {
 	unsigned long pfn;
 	struct page *page;