[PATCH] replace cad_pid by a struct pid

There are a few places in the kernel where the init task is signaled.  The
ctrl+alt+del sequence is one them.  It kills a task, usually init, using a
cached pid (cad_pid).

This patch replaces the pid_t by a struct pid to avoid pid wrap around
problem.  The struct pid is initialized at boot time in init() and can be
modified through systctl with

	/proc/sys/kernel/cad_pid

[ I haven't found any distro using it ? ]

It also introduces a small helper routine kill_cad_pid() which is used
where it seemed ok to use cad_pid instead of pid 1.

[akpm@osdl.org: cleanups, build fix]
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/parisc/power.c b/drivers/parisc/power.c
index fad5a33bf0fa..4a9f025a6b58 100644
--- a/drivers/parisc/power.c
+++ b/drivers/parisc/power.c
@@ -84,8 +84,7 @@
 
 static void deferred_poweroff(void *dummy)
 {
-	extern int cad_pid;	/* from kernel/sys.c */
-	if (kill_proc(cad_pid, SIGINT, 1)) {
+	if (kill_cad_pid(SIGINT, 1)) {
 		/* just in case killing init process failed */
 		machine_power_off();
 	}