mm: migration: cleanup migrate_pages API by matching types for offlining and sync

With the introduction of the boolean sync parameter, the API looks a
little inconsistent as offlining is still an int. Convert offlining to a
bool for the sake of being tidy.

Signed-off-by: Mel Gorman <[e-mail]>
Cc: Andrea Arcangeli <[e-mail]>
Cc: KOSAKI Motohiro <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Acked-by: Johannes Weiner <[e-mail]>
Cc: Andy Whitcroft <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/migrate.h

···
 extern int migrate_page(struct address_space *,
 			struct page *, struct page *);
 extern int migrate_pages(struct list_head *l, new_page_t x,
-			unsigned long private, int offlining,
+			unsigned long private, bool offlining,
 			bool sync);
 extern int migrate_huge_pages(struct list_head *l, new_page_t x,
-			unsigned long private, int offlining,
+			unsigned long private, bool offlining,
 			bool sync);
 
 extern int fail_migrate_page(struct address_space *,
···
 
 static inline void putback_lru_pages(struct list_head *l) {}
 static inline int migrate_pages(struct list_head *l, new_page_t x,
-		unsigned long private, int offlining,
+		unsigned long private, bool offlining,
 		bool sync) { return -ENOSYS; }
 static inline int migrate_huge_pages(struct list_head *l, new_page_t x,
-		unsigned long private, int offlining,
+		unsigned long private, bool offlining,
 		bool sync) { return -ENOSYS; }
 
 static inline int migrate_prep(void) { return -ENOSYS; }

mm/compaction.c

···
 
 		nr_migrate = cc->nr_migratepages;
 		migrate_pages(&cc->migratepages, compaction_alloc,
-				(unsigned long)cc, 0,
+				(unsigned long)cc, false,
 				cc->sync);
 		update_nr_listpages(cc);
 		nr_remaining = cc->nr_migratepages;

mm/memory_hotplug.c

···
 		}
 		/* this function returns # of failed pages */
 		ret = migrate_pages(&source, hotremove_migrate_alloc, 0,
-								1, true);
+								true, true);
 		if (ret)
 			putback_lru_pages(&source);
 	}

mm/mempolicy.c

···
 		return PTR_ERR(vma);
 
 	if (!list_empty(&pagelist)) {
-		err = migrate_pages(&pagelist, new_node_page, dest, 0, true);
+		err = migrate_pages(&pagelist, new_node_page, dest,
+								false, true);
 		if (err)
 			putback_lru_pages(&pagelist);
 	}
···
 
 		if (!list_empty(&pagelist)) {
 			nr_failed = migrate_pages(&pagelist, new_vma_page,
-						(unsigned long)vma, 0, true);
+						(unsigned long)vma,
+						false, true);
 			if (nr_failed)
 				putback_lru_pages(&pagelist);
 		}

mm/migrate.c

···
  * to the newly allocated page in newpage.
  */
 static int unmap_and_move(new_page_t get_new_page, unsigned long private,
-			struct page *page, int force, int offlining, bool sync)
+			struct page *page, int force, bool offlining, bool sync)
 {
 	int rc = 0;
 	int *result = NULL;
···
  */
 static int unmap_and_move_huge_page(new_page_t get_new_page,
 				unsigned long private, struct page *hpage,
-				int force, int offlining, bool sync)
+				int force, bool offlining, bool sync)
 {
 	int rc = 0;
 	int *result = NULL;
···
  * Return: Number of pages not migrated or error code.
  */
 int migrate_pages(struct list_head *from,
-		new_page_t get_new_page, unsigned long private, int offlining,
+		new_page_t get_new_page, unsigned long private, bool offlining,
 		bool sync)
 {
 	int retry = 1;
···
 }
 
 int migrate_huge_pages(struct list_head *from,
-		new_page_t get_new_page, unsigned long private, int offlining,
+		new_page_t get_new_page, unsigned long private, bool offlining,
 		bool sync)
 {
 	int retry = 1;