]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
pid namespaces: define is_global_init() and is_container_init()
authorSerge E. Hallyn <serue@us.ibm.com>
Fri, 19 Oct 2007 06:39:52 +0000 (23:39 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 19 Oct 2007 18:53:37 +0000 (11:53 -0700)
commitb460cbc581a53cc088ceba80608021dd49c63c43
tree83c28d0adbc15f4157c77b40fa60c40a71cb8673
parent3743ca05ff464b8a9e345c08a6c9ce30485f9805
pid namespaces: define is_global_init() and is_container_init()

is_init() is an ambiguous name for the pid==1 check.  Split it into
is_global_init() and is_container_init().

A cgroup init has it's tsk->pid == 1.

A global init also has it's tsk->pid == 1 and it's active pid namespace
is the init_pid_ns.  But rather than check the active pid namespace,
compare the task structure with 'init_pid_ns.child_reaper', which is
initialized during boot to the /sbin/init process and never changes.

Changelog:

2.6.22-rc4-mm2-pidns1:
- Use 'init_pid_ns.child_reaper' to determine if a given task is the
  global init (/sbin/init) process. This would improve performance
  and remove dependence on the task_pid().

2.6.21-mm2-pidns2:

- [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
  ppc,avr32}/traps.c for the _exception() call to is_global_init().
  This way, we kill only the cgroup if the cgroup's init has a
  bug rather than force a kernel panic.

[akpm@linux-foundation.org: fix comment]
[sukadev@us.ibm.com: Use is_global_init() in arch/m32r/mm/fault.c]
[bunk@stusta.de: kernel/pid.c: remove unused exports]
[sukadev@us.ibm.com: Fix capability.c to work with threaded init]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Acked-by: Pavel Emelianov <xemul@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Herbert Poetzel <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
32 files changed:
arch/alpha/mm/fault.c
arch/arm/mm/fault.c
arch/avr32/kernel/traps.c
arch/avr32/mm/fault.c
arch/ia64/mm/fault.c
arch/m32r/mm/fault.c
arch/m68k/mm/fault.c
arch/mips/mm/fault.c
arch/powerpc/kernel/traps.c
arch/powerpc/mm/fault.c
arch/powerpc/platforms/pseries/ras.c
arch/ppc/kernel/traps.c
arch/ppc/mm/fault.c
arch/s390/lib/uaccess_pt.c
arch/s390/mm/fault.c
arch/sh/mm/fault.c
arch/sh64/mm/fault.c
arch/um/kernel/trap.c
arch/x86/lib/usercopy_32.c
arch/x86/mm/fault_32.c
arch/x86/mm/fault_64.c
arch/xtensa/mm/fault.c
drivers/char/sysrq.c
include/linux/sched.h
kernel/capability.c
kernel/exit.c
kernel/kexec.c
kernel/pid.c
kernel/signal.c
kernel/sysctl.c
mm/oom_kill.c
security/commoncap.c