linux-kernel - Re: [PATCH] sched: rewrite SCHED_CPUMASK

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Message-ID: <20081106080057.GF8459@elte.hu>
Date:	Thu, 6 Nov 2008 09:00:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: rewrite SCHED_CPUMASK_ALLOC


* Li Zefan <lizf@...fujitsu.com> wrote:

>  #if	NR_CPUS > 128
> -#define	SCHED_CPUMASK_ALLOC		1
> -#define	SCHED_CPUMASK_FREE(v)		kfree(v)
> -#define	SCHED_CPUMASK_DECLARE(v)	struct allmasks *v
> +#define SCHED_CPUMASK_DECLARE(v)	struct allmasks *v
> +#define SCHED_CPUMASK_ALLOC(v)		v = kmalloc(sizeof(*v), GFP_KERNEL)
> +#define SCHED_CPUMASK_FREE(v)		kfree(v)
>  #else
> -#define	SCHED_CPUMASK_ALLOC		0
> -#define	SCHED_CPUMASK_FREE(v)
> -#define	SCHED_CPUMASK_DECLARE(v)	struct allmasks _v, *v = &_v
> +#define SCHED_CPUMASK_DECLARE(v)	struct allmasks _v, *v = &_v
> +#define SCHED_CPUMASK_ALLOC(v)
> +#define SCHED_CPUMASK_FREE(v)
>  #endif

ok, the #ifdef removal is nice, but we can make it even cleaner: 
please just change it to a sched_cpumask_alloc() inline. That way 
SCHED_CPUMASK_DECLARE() can go away as well: just declare the 
variable, it will be unused in the <128 CPUs case.

	Ingo
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