linux-kernel - Re: [PATCH] cpumask: introduce new API, without changing anything

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Message-Id: <20081107005229.53d6f2e3.akpm@linux-foundation.org>
Date:	Fri, 7 Nov 2008 00:52:29 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Mike Travis <travis@....com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpumask: introduce new API, without changing anything

On Fri, 7 Nov 2008 09:40:16 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> +#if NR_CPUS == 1
> +/* Uniprocesor. */
> +#define cpumask_first(src)		({ (void)(src); 0; })
>
> ...
>
> +#else
> +static inline unsigned int cpumask_first(const struct cpumask *srcp)
> +{
> +	return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
> +}
>
> ...
>
> +#endif /* SMP */

So I can happily compile and run

	cpumask_first("hello, world");

with CONFIG_SMP=n?

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