linux/arch/x86
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
..
boot [x86] remove uses of magic macros for boot_params access 2007-10-16 17:38:31 -07:00
crypto x86_64: move crypto 2007-10-11 11:17:03 +02:00
ia32 sysctl: x86_64 remove unnecessary binary paths 2007-10-18 14:37:22 -07:00
kernel kmap leak fix for x86_32 kdump 2007-10-19 11:53:33 -07:00
lib pid namespaces: define is_global_init() and is_container_init() 2007-10-19 11:53:37 -07:00
mach-default x86: clean up struct irqaction initializers 2007-10-17 20:16:06 +02:00
mach-es7000 i386: es7000 minor cleanups 2007-10-17 20:16:15 +02:00
mach-generic i386: make struct apic_probe static 2007-10-17 20:15:54 +02:00
mach-visws [x86] remove uses of magic macros for boot_params access 2007-10-16 17:38:31 -07:00
mach-voyager x86: expand /proc/interrupts to include missing vectors, v2 2007-10-17 20:16:53 +02:00
math-emu kbuild: fix up CFLAGS usage 2007-10-14 21:49:42 +02:00
mm pid namespaces: define is_global_init() and is_container_init() 2007-10-19 11:53:37 -07:00
oprofile i386: make Oprofile call shutdown() only once per session 2007-10-17 20:15:14 +02:00
pci x86: pci use pci=bfsort for HP DL385 G2 and DL585 G2 2007-10-17 20:15:46 +02:00
power i386: move power 2007-10-11 11:16:34 +02:00
vdso x86: vdso linker script cleanup 2007-10-17 20:17:06 +02:00
video i386: move video 2007-10-11 11:16:56 +02:00
xen Merge ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-x86 2007-10-17 13:13:16 -07:00