mm/z3fold.c: remove z3fold_migration trylock

z3fold_page_migrate() will never succeed because it attempts to acquire
a lock that has already been taken by migrate.c in __unmap_and_move().

  __unmap_and_move() migrate.c
    trylock_page(oldpage)
    move_to_new_page(oldpage_newpage)
      a_ops->migrate_page(oldpage, newpage)
        z3fold_page_migrate(oldpage, newpage)
          trylock_page(oldpage)

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 1f86298 ("mm/z3fold.c: support page migration")
Signed-off-by: Henry Burns <[email protected]>
Reviewed-by: Shakeel Butt <[email protected]>
Cc: Vitaly Wool <[email protected]>
Cc: Vitaly Vul <[email protected]>
Cc: Jonathan Adams <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Snild Dolkow <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

mm/z3fold.c

@@ -1350,16 +1350,11 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa
 	zhdr = page_address(page);
 	pool = zhdr_to_pool(zhdr);
 
-	if (!trylock_page(page))
-		return -EAGAIN;
-
 	if (!z3fold_page_trylock(zhdr)) {
-		unlock_page(page);
 		return -EAGAIN;
 	}
 	if (zhdr->mapped_count != 0) {
 		z3fold_page_unlock(zhdr);
-		unlock_page(page);
 		return -EBUSY;
 	}
 	new_zhdr = page_address(newpage);
@@ -1391,7 +1386,6 @@ static int z3fold_page_migrate(struct address_space *mapping, struct page *newpa
 	queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);
 
 	page_mapcount_reset(page);
-	unlock_page(page);
 	put_page(page);
 	return 0;
 }