mm: kfence: convert to DEFINE_SEQ_ATTRIBUTE

Use DEFINE_SEQ_ATTRIBUTE helper macro to simplify the code.

Link: https://lkml.kernel.org/r/20220909083140.3592919-1-liushixin2@huawei.com
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/kfence/core.c

@@ -719,24 +719,13 @@ static int show_object(struct seq_file *seq, void *v)
 	return 0;
 }
 
-static const struct seq_operations object_seqops = {
+static const struct seq_operations objects_sops = {
 	.start = start_object,
 	.next = next_object,
 	.stop = stop_object,
 	.show = show_object,
 };
-
-static int open_objects(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &object_seqops);
-}
-
-static const struct file_operations objects_fops = {
-	.open = open_objects,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = seq_release,
-};
+DEFINE_SEQ_ATTRIBUTE(objects);
 
 static int __init kfence_debugfs_init(void)
 {