These values represent the nesting level of a namespace and
pids living in it, and it's always non-negative.
Turning this from int to unsigned int saves some space in
pid.c (11 bytes on x86 and 64 on ia64) by letting the compiler
optimize the pid_nr_ns a bit. E.g. on ia64 this removes the
sign extension calls, which compiler adds to optimize access
to pid->nubers[ns->level].
Signed-off-by: Pavel Emelyanov <[EMAIL PROTECTED]>
---
diff --git a/include/linux/pid.h b/include/linux/pid.h
index c798081..03573e3 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -60,7 +60,7 @@ struct pid
/* lists of tasks that use this pid */
struct hlist_head tasks[PIDTYPE_MAX];
struct rcu_head rcu;
- int level;
+ unsigned int level;
struct upid numbers[1];
};
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index fcd61fa..caff528 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -20,7 +20,7 @@ struct pid_namespace {
int last_pid;
struct task_struct *child_reaper;
struct kmem_cache *pid_cachep;
- int level;
+ unsigned int level;
struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
struct vfsmount *proc_mnt;
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 6d792b6..cb17497 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -66,7 +66,7 @@ err_alloc:
return NULL;
}
-static struct pid_namespace *create_pid_namespace(int level)
+static struct pid_namespace *create_pid_namespace(unsigned int level)
{
struct pid_namespace *ns;
int i;
--
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