[PATCH v2 -next 01/11] cgroup/cpuset: introduce cpuset-v1.c

[Chen Ridong <chenridong@huawei.com>]

This patch introduces the cgroup/cpuset-v1.c source file which will be
used for all legacy (cgroup v1) cpuset cgroup code. It also introduces
cgroup/cpuset-internal.h to keep declarations shared between
cgroup/cpuset.c and cpuset/cpuset-v1.c.

As of now, let's compile it if CONFIG_CPUSET is set. Later on it can be
switched to use a separate config option, so that the legacy code won't be
compiled if not required.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
---
 MAINTAINERS                     | 2 ++
 kernel/cgroup/Makefile          | 2 +-
 kernel/cgroup/cpuset-internal.h | 7 +++++++
 kernel/cgroup/cpuset-v1.c       | 4 ++++
 4 files changed, 14 insertions(+), 1 deletion(-)
 create mode 100644 kernel/cgroup/cpuset-internal.h
 create mode 100644 kernel/cgroup/cpuset-v1.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 82e3924816d2..3b5ec1cafd95 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5698,6 +5698,8 @@ S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git
 F:	Documentation/admin-guide/cgroup-v1/cpusets.rst
 F:	include/linux/cpuset.h
+F:	kernel/cgroup/cpuset-internal.h
+F:	kernel/cgroup/cpuset-v1.c
 F:	kernel/cgroup/cpuset.c
 F:	tools/testing/selftests/cgroup/test_cpuset.c
 F:	tools/testing/selftests/cgroup/test_cpuset_prs.sh
diff --git a/kernel/cgroup/Makefile b/kernel/cgroup/Makefile
index 12f8457ad1f9..005ac4c675cb 100644
--- a/kernel/cgroup/Makefile
+++ b/kernel/cgroup/Makefile
@@ -4,6 +4,6 @@ obj-y := cgroup.o rstat.o namespace.o cgroup-v1.o freezer.o
 obj-$(CONFIG_CGROUP_FREEZER) += legacy_freezer.o
 obj-$(CONFIG_CGROUP_PIDS) += pids.o
 obj-$(CONFIG_CGROUP_RDMA) += rdma.o
-obj-$(CONFIG_CPUSETS) += cpuset.o
+obj-$(CONFIG_CPUSETS) += cpuset.o cpuset-v1.o
 obj-$(CONFIG_CGROUP_MISC) += misc.o
 obj-$(CONFIG_CGROUP_DEBUG) += debug.o
diff --git a/kernel/cgroup/cpuset-internal.h b/kernel/cgroup/cpuset-internal.h
new file mode 100644
index 000000000000..6605be417e32
--- /dev/null
+++ b/kernel/cgroup/cpuset-internal.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __CPUSET_INTERNAL_H
+#define __CPUSET_INTERNAL_H
+
+#endif /* __CPUSET_INTERNAL_H */
+
diff --git a/kernel/cgroup/cpuset-v1.c b/kernel/cgroup/cpuset-v1.c
new file mode 100644
index 000000000000..ae166eb4f75d
--- /dev/null
+++ b/kernel/cgroup/cpuset-v1.c
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "cpuset-internal.h"
+
-- 
2.34.1