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Date: Thu, 16 Oct 2008 12:58:27 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: adobriyan@gmail.com, menage@google.com, pj@sgi.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/4] seq_file: Add seq_cpumask_list(),
 seq_nodemask_list()
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On Sun, 12 Oct 2008 17:29:25 +0800
Lai Jiangshan <laijs@cn.fujitsu.com> wrote:

> +static inline int seq_cpumask_list(struct seq_file *m, cpumask_t *mask)
> +{
> +	return seq_bitmap_list(m, mask->bits, NR_CPUS);
> +}

Is it possible to avoid using NR_CPUS?  In some situations it'd be much
more efficient to use the runtime-determined max possible cpu index.

But I don't immediately recall how to get at that number. 
num_possible_cpus() assumes that there are no holes in the CPU
identifier list.