1 files changed, 23 insertions, 0 deletions

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
new file mode 100644
index 000000000000..54d79095e295
--- /dev/null
+++ b/include/linux/pid_namespace.h
@@ -0,0 +1,23 @@
+#ifndef _LINUX_PID_NS_H
+#define _LINUX_PID_NS_H
+
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/threads.h>
+#include <linux/pid.h>
+
+struct pidmap {
+       atomic_t nr_free;
+       void *page;
+};
+
+#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
+
+struct pid_namespace {
+       struct pidmap pidmap[PIDMAP_ENTRIES];
+       int last_pid;
+};
+
+extern struct pid_namespace init_pid_ns;
+
+#endif /* _LINUX_PID_NS_H */