提交 417e3152 编写于 作者: A André Goddard Rosa 提交者: Linus Torvalds

pid: reduce code size by using a pointer to iterate over array

It decreases code size by 16 bytes on my gcc 4.4.1 on Core 2:
  text    data     bss     dec     hex filename
  4314    2216       8    6538    198a kernel/pid.o-BEFORE
  4298    2216       8    6522    197a kernel/pid.o-AFTER
Signed-off-by: NAndré Goddard Rosa <andre.goddard@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 7be6d991
...@@ -269,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespace *ns) ...@@ -269,12 +269,11 @@ struct pid *alloc_pid(struct pid_namespace *ns)
for (type = 0; type < PIDTYPE_MAX; ++type) for (type = 0; type < PIDTYPE_MAX; ++type)
INIT_HLIST_HEAD(&pid->tasks[type]); INIT_HLIST_HEAD(&pid->tasks[type]);
upid = pid->numbers + ns->level;
spin_lock_irq(&pidmap_lock); spin_lock_irq(&pidmap_lock);
for (i = ns->level; i >= 0; i--) { for ( ; upid >= pid->numbers; --upid)
upid = &pid->numbers[i];
hlist_add_head_rcu(&upid->pid_chain, hlist_add_head_rcu(&upid->pid_chain,
&pid_hash[pid_hashfn(upid->nr, upid->ns)]); &pid_hash[pid_hashfn(upid->nr, upid->ns)]);
}
spin_unlock_irq(&pidmap_lock); spin_unlock_irq(&pidmap_lock);
out: out:
......
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