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Date:   Tue, 20 Mar 2018 13:39:18 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Dou Liyang <douly.fnst@cn.fujitsu.com>
Cc:     linux-kernel@vger.kernel.org, x86@kernel.org,
        linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org,
        tglx@linutronix.de, mingo@redhat.com, corbet@lwn.net,
        rjw@rjwysocki.net, lenb@kernel.org, hpa@zytor.com
Subject: Re: [PATCH 3/5] x86/smpboot: Make the check code more clear in
 prefill_possible_map()
Message-ID: <20180320123918.GS4043@hirez.programming.kicks-ass.net>
References: <20180320110432.28127-1-douly.fnst@cn.fujitsu.com>
 <20180320110432.28127-4-douly.fnst@cn.fujitsu.com>
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On Tue, Mar 20, 2018 at 07:04:30PM +0800, Dou Liyang wrote:
> case 1: no  | no  | no | -->  min (setup_possible_cpus, nr_cpu_ids, setup_max_cpus)
> case 2: no  | no  | yes| -->  min (setup_possible_cpus, nr_cpu_ids)
> case 3: no  | yes | no | -->  1                                    
> case 4: no  | yes | yes| -->  1
> case 5: yes | no  | no | -->  min (num_processors, nr_cpu_ids, setup_max_cpus)
> case 6: yes | no  | yes| -->  min (num_processors + disabled_cpus, nr_cpu_ids)
> case 7: yes | yes | no | -->  1 
> case 8: yes | yes | yes| -->  1

The case number is off by one ;-)