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c/r: introduce CHECKPOINT_RESTORE symbol
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For checkpoint/restore we need auxilary features being compiled into the
kernel, such as additional prctl codes, /proc/<pid>/map_files and etc...
but same time these features are not mandatory for a regular kernel so
CHECKPOINT_RESTORE config symbol should bring a way to disable them all at
once if one wish to get rid of additional functionality.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Cyrill Gorcunov authored and torvalds committed Jan 13, 2012
1 parent 85bbddc commit 067bce1
Showing 1 changed file with 11 additions and 0 deletions.
11 changes: 11 additions & 0 deletions init/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -783,6 +783,17 @@ config DEBUG_BLK_CGROUP

endif # CGROUPS

config CHECKPOINT_RESTORE
bool "Checkpoint/restore support" if EXPERT
default n
help
Enables additional kernel features in a sake of checkpoint/restore.
In particular it adds auxiliary prctl codes to setup process text,
data and heap segment sizes, and a few additional /proc filesystem
entries.

If unsure, say N here.

menuconfig NAMESPACES
bool "Namespaces support" if EXPERT
default !EXPERT
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