* [PATCH] sysctl: Make kernel.ns_last_pid control being CHECKPOINT_RESTORE dependent
@ 2012-01-13 15:12 Cyrill Gorcunov
0 siblings, 0 replies; only message in thread
From: Cyrill Gorcunov @ 2012-01-13 15:12 UTC (permalink / raw)
To: Andrew Morton; +Cc: LKML, Pavel Emelyanov, Tejun Heo, Oleg Nesterov
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>
CC: Andrew Morton <akpm@linux-foundation.org>
---
Since there only two places where CONFIG_ is needed, I think
plain #ifdef better than some helper function with bare body
and unconditional call.
kernel/pid_namespace.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux-2.6.git/kernel/pid_namespace.c
===================================================================
--- linux-2.6.git.orig/kernel/pid_namespace.c
+++ linux-2.6.git/kernel/pid_namespace.c
@@ -191,6 +191,7 @@ void zap_pid_ns_processes(struct pid_nam
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)
{
@@ -218,13 +219,16 @@ static struct ctl_table pid_ns_ctl_table
},
{ }
};
-
static struct ctl_path kern_path[] = { { .procname = "kernel", }, { } };
+#endif /* CONFIG_CHECKPOINT_RESTORE */
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;
}
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