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authorCedric Le Goater <clg@fr.ibm.com>2006-10-02 02:19:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-02 07:57:25 -0700
commit9ec52099e4b8678a60e9f93e41ad87885d64f3e6 (patch)
treea68fe051b39f8f8e8be469cbd3c2f653b9b71a9d /arch
parent1a657f78dcc8ea7c53eaa1f2a45ea2315738c15f (diff)
downloadlinux-9ec52099e4b8678a60e9f93e41ad87885d64f3e6.tar.bz2
[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 'arch')
-rw-r--r--arch/mips/sgi-ip22/ip22-reset.c3
-rw-r--r--arch/mips/sgi-ip32/ip32-reset.c2
-rw-r--r--arch/powerpc/platforms/iseries/mf.c2
3 files changed, 4 insertions, 3 deletions
diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c
index 8134220ed600..7a941ecff3bb 100644
--- a/arch/mips/sgi-ip22/ip22-reset.c
+++ b/arch/mips/sgi-ip22/ip22-reset.c
@@ -123,7 +123,8 @@ static inline void power_button(void)
if (machine_state & MACHINE_PANICED)
return;
- if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) {
+ if ((machine_state & MACHINE_SHUTTING_DOWN) ||
+ kill_cad_pid(SIGINT, 1)) {
/* No init process or button pressed twice. */
sgi_machine_power_off();
}
diff --git a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c
index 79ddb4605659..fd0932b2d521 100644
--- a/arch/mips/sgi-ip32/ip32-reset.c
+++ b/arch/mips/sgi-ip32/ip32-reset.c
@@ -120,7 +120,7 @@ static inline void ip32_power_button(void)
if (has_panicked)
return;
- if (shuting_down || kill_proc(1, SIGINT, 1)) {
+ if (shuting_down || kill_cad_pid(SIGINT, 1)) {
/* No init process or button pressed twice. */
ip32_machine_power_off();
}
diff --git a/arch/powerpc/platforms/iseries/mf.c b/arch/powerpc/platforms/iseries/mf.c
index 1a2c2a50f922..1983b640bac1 100644
--- a/arch/powerpc/platforms/iseries/mf.c
+++ b/arch/powerpc/platforms/iseries/mf.c
@@ -357,7 +357,7 @@ static int dma_and_signal_ce_msg(char *ce_msg,
*/
static int shutdown(void)
{
- int rc = kill_proc(1, SIGINT, 1);
+ int rc = kill_cad_pid(SIGINT, 1);
if (rc) {
printk(KERN_ALERT "mf.c: SIGINT to init failed (%d), "