linux-kernel - [PATCH] sysctl: Make kernel.ns_last_pid control being CHECKPOINT

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Date:	Fri, 13 Jan 2012 19:12:10 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Subject: [PATCH] sysctl: Make kernel.ns_last_pid control being
 CHECKPOINT_RESTORE dependent

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@...nvz.org>
CC: Pavel Emelyanov <xemul@...allels.com>
CC: Tejun Heo <tj@...nel.org>
CC: Oleg Nesterov <oleg@...hat.com>
CC: Andrew Morton <akpm@...ux-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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