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authorManfred Spraul <manfred@colorfullife.com>2011-11-03 00:38:56 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-03 03:07:01 +0400
commitf567a18590742b811287b7512fb0908deac4eef7 (patch)
tree5ed76fc1727cbce2b64776afd5c682414f0c1726 /include/linux/sem.h
parente57940d719e9fc5223d133b631f8cb5232d6064e (diff)
downloadlinux-f567a18590742b811287b7512fb0908deac4eef7.tar.xz
include/linux/sem.h: make sysv_sem empty if SYSVIPC is disabled
For the sysvsem undo, each task struct contains a sysv_sem structure with a pointer to the undo information. This pointer is only necessary if sysvipc is enabled - thus the pointer can be made conditional on CONFIG_SYSVIPC. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/sem.h')
-rw-r--r--include/linux/sem.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/sem.h b/include/linux/sem.h
index 464842621a4a..10d6b226afc5 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -96,16 +96,21 @@ struct sem_array {
int complex_count; /* pending complex operations */
};
+#ifdef CONFIG_SYSVIPC
+
struct sysv_sem {
struct sem_undo_list *undo_list;
};
-#ifdef CONFIG_SYSVIPC
-
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)
{
return 0;