plist: Split out plist_types.h

Trimming down sched.h dependencies: we don't want to include more than
the base types.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

include/linux/plist.h

@@ -75,20 +75,10 @@
 
 #include <linux/container_of.h>
 #include <linux/list.h>
-#include <linux/types.h>
+#include <linux/plist_types.h>
 
 #include <asm/bug.h>
 
-struct plist_head {
-	struct list_head node_list;
-};
-
-struct plist_node {
-	int			prio;
-	struct list_head	prio_list;
-	struct list_head	node_list;
-};
-
 /**
  * PLIST_HEAD_INIT - static struct plist_head initializer
  * @head:	struct plist_head variable name

include/linux/plist_types.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _LINUX_PLIST_TYPES_H
+#define _LINUX_PLIST_TYPES_H
+
+#include <linux/types.h>
+
+struct plist_head {
+	struct list_head node_list;
+};
+
+struct plist_node {
+	int			prio;
+	struct list_head	prio_list;
+	struct list_head	node_list;
+};
+
+#endif /* _LINUX_PLIST_TYPES_H */

include/linux/sched.h

@@ -16,7 +16,7 @@
 #include <linux/shm.h>
 #include <linux/kmsan_types.h>
 #include <linux/mutex_types.h>
-#include <linux/plist.h>
+#include <linux/plist_types.h>
 #include <linux/hrtimer_types.h>
 #include <linux/irqflags.h>
 #include <linux/seccomp.h>

init/init_task.c

@@ -12,6 +12,7 @@
 #include <linux/audit.h>
 #include <linux/numa.h>
 #include <linux/scs.h>
+#include <linux/plist.h>
 
 #include <linux/uaccess.h>
 

kernel/futex/core.c

@@ -34,6 +34,7 @@
 #include <linux/compat.h>
 #include <linux/jhash.h>
 #include <linux/pagemap.h>
+#include <linux/plist.h>
 #include <linux/memblock.h>
 #include <linux/fault-inject.h>
 #include <linux/slab.h>

kernel/futex/requeue.c

 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <linux/plist.h>
 #include <linux/sched/signal.h>
 
 #include "futex.h"

kernel/futex/waitwake.c

 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <linux/plist.h>
 #include <linux/sched/task.h>
 #include <linux/sched/signal.h>
 #include <linux/freezer.h>

mm/swapfile.c

@@ -42,6 +42,7 @@
 #include <linux/completion.h>
 #include <linux/suspend.h>
 #include <linux/zswap.h>
+#include <linux/plist.h>
 
 #include <asm/tlbflush.h>
 #include <linux/swapops.h>