linux-kernel - Re: [PATCH 1/3] cpumask: add for_each_online_cpu_mask

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Date:	Fri, 12 Sep 2008 14:33:22 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	Jes Sorensen <jes@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] cpumask: add for_each_online_cpu_mask_nr function

On Wednesday 10 September 2008 01:50:14 Mike Travis wrote:
>   * Add for_each_online_cpu_mask_nr() function to eliminate need for
>     a common use of a temporary cpumask_t variable.  When the following
>     procedure is being used:
>
>     funcproto(cpumask_t *mask, ...)
>     {
> 	cpumask_t temp;
>
> 	cpus_and(temp, *mask, cpu_online_map);
> 	for_each_cpu_mask_nr(cpu, temp)
> 		...
>
>     If then becomes:
>
>     funcproto(cpumask_t *mask, ...)
>     {
> 	for_each_online_cpu_mask_nr(cpu, *mask)
> 		...
>
>   * Note the generic __next_cpu_and (and __next_cpu_and_nr) functions
>     allowing AND'ing with any cpumask_t variable, not just the
> cpu_online_map.

Good idea!  But I really dislike the _nr versions (too many names!).  Do we 
really need them, since by definition cpus after nr_cpu_ids are never 
online...

(And we should initialize nr_cpu_ids to NR_CPUS so even early boot works, if 
we don't already...).

Cheers,
Rusty.
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