linux/arch/um
Serge E. Hallyn b460cbc581 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>
2007-10-19 11:53:37 -07:00
..
drivers [UMP]: header_ops conversion needed for non-ethernet drivers 2007-10-17 19:35:04 -07:00
include uml: fix stub address calculations 2007-10-16 09:43:09 -07:00
kernel pid namespaces: define is_global_init() and is_container_init() 2007-10-19 11:53:37 -07:00
os-Linux uml: definitively kill subprocesses on panic 2007-10-16 09:43:09 -07:00
scripts uml: throw out CONFIG_MODE_TT 2007-10-16 09:43:05 -07:00
sys-i386 remove include/asm-*/ipc.h 2007-10-17 08:42:55 -07:00
sys-ia64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
sys-ppc kbuild: enable 'make AFLAGS=...' to add additional options to AS 2007-10-15 21:59:31 +02:00
sys-x86_64 uml: fix stub address calculations 2007-10-16 09:43:09 -07:00
defconfig uml: fix stub address calculations 2007-10-16 09:43:09 -07:00
Kconfig uml: tickless support 2007-10-16 09:43:08 -07:00
Kconfig.char uml: style fixes pass 1 2007-10-16 09:43:05 -07:00
Kconfig.debug uml: style fixes pass 1 2007-10-16 09:43:05 -07:00
Kconfig.i386 uml: fix stub address calculations 2007-10-16 09:43:09 -07:00
Kconfig.net uml: add VDE networking support 2007-10-16 09:43:05 -07:00
Kconfig.x86_64 uml: fix stub address calculations 2007-10-16 09:43:09 -07:00
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-10-16 11:23:06 -07:00
Makefile-i386 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-10-16 11:23:06 -07:00
Makefile-ia64 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile-os-Linux kbuild: enable 'make CFLAGS=...' to add additional options to CC 2007-10-14 22:21:35 +02:00
Makefile-ppc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile-skas [PATCH] uml makefiles sanitized 2005-09-29 08:46:26 -07:00
Makefile-tt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile-x86_64 Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild 2007-10-16 11:23:06 -07:00