memcg: Add missing copyright

+ convert doc to docparse and use macro to use kselftest docs clickable.

Signed-off-by: Petr Vorel <pvorel@suse.cz>

Author: pevik

testcases/kernel/controllers/memcg/memcontrol01.c

@@ -1,18 +1,21 @@
 // SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021-2022 Richard Palethorpe <rpalethorpe@suse.com>
+ */
+
 /*\
+ * Conversion of the first kself test in :kselftest:`cgroup/test_memcontrol.c`.
  *
- * Conversion of the first kself test in cgroup/test_memcontrol.c.
  * This test creates two nested cgroups with and without enabling the
  * memory controller.
  *
  * The LTP API automatically adds controllers to subtree_control when
  * a child cgroup is added. So unlike the kselftest we remove the
  * controller after it being added automatically.
  */
-#define _GNU_SOURCE
 
+#define _GNU_SOURCE
 #include <stdio.h>
-
 #include "tst_test.h"
 
 static struct tst_cg_group *parent, *child;

testcases/kernel/controllers/memcg/memcontrol02.c

@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021-2022 Richard Palethorpe <rpalethorpe@suse.com>
+ */
+
 /*\
- *
- * Conversion of second kself test in cgroup/test_memcontrol.c.
+ * Conversion of second kself test in :kselftest:`cgroup/test_memcontrol.c`.
  *
  * Original description:
  *
@@ -20,8 +23,8 @@
  * - On EXFAT and extN we change the margin of error between all and file
  *   memory to 50%. Because these allocate non-page-cache memory during writes.
  */
-#define _GNU_SOURCE
 
+#define _GNU_SOURCE
 #include "memcontrol_common.h"
 
 static size_t page_size;

testcases/kernel/controllers/memcg/memcontrol03.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*\
  *
- * Conversion of the third kself test in cgroup/test_memcontrol.c.
+ * Conversion of the third kself test in :kselftest:`cgroup/test_memcontrol.c`.
  *
  * Original description:
  * "First, this test creates the following hierarchy:

testcases/kernel/controllers/memcg/memcontrol04.c

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*\
  *
- * Conversion of the forth kself test in cgroup/test_memcontrol.c.
+ * Conversion of the forth kself test in :kselftest:`cgroup/test_memcontrol.c`.
  *
  * Original description:
  * "First, this test creates the following hierarchy:

testcases/kernel/controllers/memcg/memcontrol_common.h

@@ -1,4 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2021-2022 Richard Palethorpe <rpalethorpe@suse.com>
+ */
 
 #ifndef MEMCONTROL_COMMON_H__
 #define MEMCONTROL_COMMON_H__

testcases/kernel/controllers/memcg/regression/memcg_test_3.c

@@ -1,14 +1,15 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2017 FUJITSU LIMITED. All rights reserved.
+ * Copyright (c) Linux Test Project, 2017-2026
  * Author: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
  */
 
-/*
- * This is a regression test for a crash caused by memcg function
- * reentrant on buggy kernel.  When doing rmdir(), a pending signal can
- * interrupt the execution and lead to cgroup_clear_css_refs()
- * being entered repeatedly, this results in a BUG_ON().
+/*\
+ * Regression test for a crash caused by memcg function reentrant on buggy
+ * kernel.  When doing rmdir(), a pending signal can interrupt the execution and
+ * lead to cgroup_clear_css_refs() being entered repeatedly, this results in a
+ * BUG_ON().
  */
 
 #include <errno.h>