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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.
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