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Date: Sun, 7 May 2006 23:17:49 -0700 (PDT)
From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
To: Shaohua Li <shaohua.li@intel.com>
cc: lkml <linux-kernel@vger.kernel.org>, Srivatsa Vaddagiri <vatsa@in.ibm.com>,
       Ashok Raj <ashok.raj@intel.com>, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 2/10] make some arch depend routines accept cpumask
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On Mon, 8 May 2006, Shaohua Li wrote:

> +int __cpuexit __cpu_disable(cpumask_t remove_mask)
>  {
>  	unsigned int cpu = smp_processor_id();
>  	struct task_struct *p;
>  	int ret;
>  
> +	BUG_ON(cpus_weight(remove_mask) != 1);
>  	ret = mach_cpu_disable(cpu);

What is this extra argument actually used for?