forked from Minki/linux
pidns: make pid->level and pid_ns->level unsigned
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 <xemul@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -60,7 +60,7 @@ struct pid
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/* lists of tasks that use this pid */
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struct hlist_head tasks[PIDTYPE_MAX];
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struct rcu_head rcu;
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int level;
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unsigned int level;
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struct upid numbers[1];
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};
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@ -20,7 +20,7 @@ struct pid_namespace {
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int last_pid;
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struct task_struct *child_reaper;
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struct kmem_cache *pid_cachep;
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int level;
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unsigned int level;
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struct pid_namespace *parent;
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#ifdef CONFIG_PROC_FS
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struct vfsmount *proc_mnt;
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@ -66,7 +66,7 @@ err_alloc:
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return NULL;
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}
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static struct pid_namespace *create_pid_namespace(int level)
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static struct pid_namespace *create_pid_namespace(unsigned int level)
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{
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struct pid_namespace *ns;
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int i;
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