This was discussed on containers and we thought it would be useful
to reserve this flag.
---

From: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Subject: [PATCH] Define CLONE_NEWPID flag

Define CLONE_NEWPID flag that will be used to clone pid namespaces.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
---
 include/linux/sched.h |    1 +
 1 file changed, 1 insertion(+)

Index: lx26-21-rc3-mm2/include/linux/sched.h
===================================================================
--- lx26-21-rc3-mm2.orig/include/linux/sched.h	2007-03-20 20:13:19.000000000 -0700
+++ lx26-21-rc3-mm2/include/linux/sched.h	2007-03-21 11:10:33.000000000 -0700
@@ -26,6 +26,7 @@
 #define CLONE_STOPPED		0x02000000	/* Start in stopped state */
 #define CLONE_NEWUTS		0x04000000	/* New utsname group? */
 #define CLONE_NEWIPC		0x08000000	/* New ipcs */
+#define CLONE_NEWPID		0x10000000      /* New pid namespace */
 
 /*
  * Scheduling policies
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