linux-kernel - Re: [PATCH] x86/apic: Eliminate cpu_mask_to

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Message-ID: <20120611082249.GC31556@gmail.com>
Date:	Mon, 11 Jun 2012 10:22:49 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH] x86/apic: Eliminate cpu_mask_to_apicid() operation


* Alexander Gordeev <agordeev@...hat.com> wrote:

> @@ -2151,7 +2134,12 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
>  			break;
>  	}
>  
> -	return __default_cpu_to_apicid(cpu, apicid);
> +	if (likely((unsigned int)cpu < nr_cpu_ids)) {
> +		*apicid = per_cpu(x86_cpu_to_apicid, cpu);
> +		return 0;
> +	} else {
> +		return -EINVAL;
> +	}

The type cast is rather ugly - why not change the cpu type to 
unsigned int?

Also, the else block is superfluous, just make it a return 
-EINVAL?

Thanks,

	Ingo
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