sem: Split out sem_types.h

More sched.h dependency pruning.

Signed-off-by: Kent Overstreet <[e-mail]>

include/linux/audit.h

···
 struct audit_watch;
 struct audit_tree;
 struct sk_buff;
+struct kern_ipc_perm;
 
 struct audit_krule {
 	u32			pflags;

include/linux/sched.h

···
 
 #include <asm/current.h>
 
+#include <linux/cache.h>
 #include <linux/irqflags_types.h>
 #include <linux/pid_types.h>
-#include <linux/sem.h>
+#include <linux/sem_types.h>
 #include <linux/shm.h>
 #include <linux/kmsan_types.h>
 #include <linux/mutex_types.h>
 #include <linux/plist_types.h>
 #include <linux/hrtimer_types.h>
+#include <linux/timer_types.h>
 #include <linux/seccomp_types.h>
 #include <linux/nodemask_types.h>
 #include <linux/rcupdate.h>

include/linux/sem.h

···
 #define _LINUX_SEM_H
 
 #include <uapi/linux/sem.h>
+#include <linux/sem_types.h>
 
 struct task_struct;
-struct sem_undo_list;
 
 #ifdef CONFIG_SYSVIPC
-
-struct sysv_sem {
-	struct sem_undo_list *undo_list;
-};
 
 extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
 extern void exit_sem(struct task_struct *tsk);
 
 #else
-
-struct sysv_sem {
-	/* empty */
-};
 
 static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
 {

include/linux/sem_types.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SEM_TYPES_H
+#define _LINUX_SEM_TYPES_H
+
+struct sem_undo_list;
+
+struct sysv_sem {
+#ifdef CONFIG_SYSVIPC
+	struct sem_undo_list *undo_list;
+#endif
+};
+
+#endif /* _LINUX_SEM_TYPES_H */