linux-kernel - Re: [PATCH resend] cpumask: don't perform while loop in cpumask_next

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Message-ID: <20150615131221.GA12596@twins.programming.kicks-ass.net>
Date:	Mon, 15 Jun 2015 15:12:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Amir Vadai <amirv@...lanox.com>, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH resend] cpumask: don't perform while loop in
 cpumask_next_and()

On Mon, Mar 02, 2015 at 12:22:03AM +0900, Sergey Senozhatsky wrote:

> +++ b/lib/cpumask.c
> @@ -37,10 +37,11 @@ EXPORT_SYMBOL(__next_cpu_nr);
>  int cpumask_next_and(int n, const struct cpumask *src1p,
>  		     const struct cpumask *src2p)
>  {
> +	struct cpumask tmp;
> +
> +	if (cpumask_and(&tmp, src1p, src2p))
> +		return cpumask_next(n, &tmp);
> +	return nr_cpu_ids;
>  }
>  EXPORT_SYMBOL(cpumask_next_and);

Just ran into this; I though we were not supposed to put cpumasks on the
stack because $BIG. ?!

explain.
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