Re: [PATCH] sched: rewrite SCHED_CPUMASK_ALLOC

[Ingo Molnar]

* Li Zefan <lizf@xxxxxxxxxxxxxx> 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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