[PATCH] task_struct: ifdef Missed'em V IPC

ipc/sem.c only.

$ agrep sysvsem -w -n
ipc/sem.c:912:  undo_list = current->sysvsem.undo_list;
ipc/sem.c:932:  undo_list = current->sysvsem.undo_list;
ipc/sem.c:954:  undo_list = current->sysvsem.undo_list;
ipc/sem.c:963:          current->sysvsem.undo_list = undo_list;
ipc/sem.c:1247:         tsk->sysvsem.undo_list = undo_list;
ipc/sem.c:1249:         tsk->sysvsem.undo_list = NULL;
ipc/sem.c:1271: undo_list = tsk->sysvsem.undo_list;
include/linux/sched.h:876:      struct sysv_sem sysvsem;

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/sched.h

@@ -886,8 +886,10 @@ struct task_struct {
 				     - initialized normally by flush_old_exec */
 /* file system info */
 	int link_count, total_link_count;
+#ifdef CONFIG_SYSVIPC
 /* ipc stuff */
 	struct sysv_sem sysvsem;
+#endif
 /* CPU-specific state of this task */
 	struct thread_struct thread;
 /* filesystem information */