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authorCedric Le Goater <clg@fr.ibm.com>2006-10-02 13:19:00 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-02 18:57:25 +0400
commit9ec52099e4b8678a60e9f93e41ad87885d64f3e6 (patch)
treea68fe051b39f8f8e8be469cbd3c2f653b9b71a9d /init/main.c
parent1a657f78dcc8ea7c53eaa1f2a45ea2315738c15f (diff)
downloadlinux-9ec52099e4b8678a60e9f93e41ad87885d64f3e6.tar.xz
[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>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index a49b00235bda..ee123243fb53 100644
--- a/init/main.c
+++ b/init/main.c
@@ -721,6 +721,8 @@ static int init(void * unused)
*/
child_reaper = current;
+ cad_pid = task_pid(current);
+
smp_prepare_cpus(max_cpus);
do_pre_smp_initcalls();