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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>
This commit is contained in:
Cyrill Gorcunov 2012-05-31 16:26:42 -07:00 committed by Linus Torvalds
parent ac34ebb3a6
commit 98ed57eef9
1 changed files with 5 additions and 1 deletions
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6
kernel/pid_namespace.c
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@ -196,6 +196,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
return; return;
} }
#ifdef CONFIG_CHECKPOINT_RESTORE
static int pid_ns_ctl_handler(struct ctl_table *table, int write, static int pid_ns_ctl_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos) 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", }, { } }; static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } };
#endif /* CONFIG_CHECKPOINT_RESTORE */
int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 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) static __init int pid_namespaces_init(void)
{ {
pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC); pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC);
#ifdef CONFIG_CHECKPOINT_RESTORE
register_sysctl_paths(kern_path, pid_ns_ctl_table); register_sysctl_paths(kern_path, pid_ns_ctl_table);
#endif
return 0; return 0;
} }