[PATCH] posix message queues: code move

From: Manfred Spraul <manfred@colorfullife.com>

cleanup of sysv ipc as a preparation for posix message queues:

- replace !CONFIG_SYSVIPC wrappers for copy_semundo and exit_sem with
  static inline wrappers.  Now the whole ipc/util.c file is only used if
  CONFIG_SYSVIPC is set, use makefile magic instead of #ifdef.

- remove the prototypes for copy_semundo and exit_sem from kernel/fork.c

- they belong into a header file.

- create a new msgutil.c with the helper functions for message queues.

- cleanup the helper functions: run Lindent, add __user tags.

2 files changed, 16 insertions, 4 deletions

diff --git a/include/linux/msg.h b/include/linux/msg.h
index b235e862a3dd..2c4c6aa643ff 100644
--- a/include/linux/msg.h
+++ b/include/linux/msg.h
@@ -74,9 +74,6 @@ struct msg_msg {
 	/* the actual message follows immediately */
 };
 
-#define DATALEN_MSG	(PAGE_SIZE-sizeof(struct msg_msg))
-#define DATALEN_SEG	(PAGE_SIZE-sizeof(struct msg_msgseg))
-
 /* one msq_queue structure for each present queue on the system */
 struct msg_queue {
 	struct kern_ipc_perm q_perm;
diff --git a/include/linux/sem.h b/include/linux/sem.h
index b337c509ac29..aaf45764a56e 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -134,7 +134,22 @@ struct sysv_sem {
 	struct sem_undo_list *undo_list;
 };
 
-void exit_sem(struct task_struct *p);
+#ifdef CONFIG_SYSVIPC
+
+extern int copy_semundo(unsigned long clone_flags, struct task_struct *tsk);
+extern void exit_sem(struct task_struct *tsk);
+
+#else
+static inline int copy_semundo(unsigned long clone_flags, struct task_struct *tsk)
+{
+	return 0;
+}
+
+static inline void exit_sem(struct task_struct *tsk)
+{
+	return;
+}
+#endif
 
 #endif /* __KERNEL__ */