[PATCH] kernel/sys.c: cleanups

- proper prototypes for the following functions:
  - ctrl_alt_del()  (in include/linux/reboot.h)
  - getrusage()     (in include/linux/resource.h)
- make the following needlessly global functions static:
  - kernel_restart_prepare()
  - kernel_kexec()

[akpm@osdl.org: compile fix]
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/mips/kernel/irixsig.c b/arch/mips/kernel/irixsig.c
index a9bf6cc..676e868 100644
--- a/arch/mips/kernel/irixsig.c
+++ b/arch/mips/kernel/irixsig.c
@@ -13,6 +13,7 @@
 #include <linux/smp_lock.h>
 #include <linux/time.h>
 #include <linux/ptrace.h>
+#include <linux/resource.h>
 
 #include <asm/ptrace.h>
 #include <asm/uaccess.h>
@@ -540,8 +541,6 @@
 #define IRIX_P_PGID   2
 #define IRIX_P_ALL    7
 
-extern int getrusage(struct task_struct *, int, struct rusage __user *);
-
 #define W_EXITED     1
 #define W_TRAPPED    2
 #define W_STOPPED    4