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authorCyrill Gorcunov <gorcunov@gmail.com>2012-05-31 16:26:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:32 -0700
commit98ed57eef9f67dfe541be0bca34660ffc88365b2 (patch)
tree1dee418c15205a31a811597587bdec9d1bc0cdd2 /kernel/pid_namespace.c
parentac34ebb3a67e699edcb5ac72f19d31679369dfaa (diff)
downloadlwn-98ed57eef9f67dfe541be0bca34660ffc88365b2.tar.gz
lwn-98ed57eef9f67dfe541be0bca34660ffc88365b2.zip
sysctl: make kernel.ns_last_pid control dependent on CHECKPOINT_RESTORE
For those who doesn't need C/R functionality there is no need to control last pid, ie the pid for the next fork() call. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Tejun Heo <tj@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/pid_namespace.c')
-rw-r--r--kernel/pid_namespace.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index fd3c44986191..16b20e38c4a1 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -196,6 +196,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
return;
}
+#ifdef CONFIG_CHECKPOINT_RESTORE
static int pid_ns_ctl_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -223,8 +224,8 @@ static struct ctl_table pid_ns_ctl_table[] = {
},
{ }
};
-
static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } };
+#endif /* CONFIG_CHECKPOINT_RESTORE */
int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
{
@@ -258,7 +259,10 @@ int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
static __init int pid_namespaces_init(void)
{
pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC);
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
register_sysctl_paths(kern_path, pid_ns_ctl_table);
+#endif
return 0;
}