linux-kernel - Re: [RFC, 3/7] NUMA hotplug emulator

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Message-ID: <4BECE052.5020907@linux.intel.com>
Date:	Fri, 14 May 2010 13:32:02 +0800
From:	Haicheng Li <haicheng.li@...ux.intel.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Alex Chiang <achiang@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.co" <ak@...ux.intel.co>,
	"shaohui.zheng@...ux.intel.com" <shaohui.zheng@...ux.intel.com>
Subject: Re: [RFC, 3/7] NUMA hotplug emulator

Wu Fengguang wrote:
>> Pls. replace it with following code:
>>
>> +#ifdef CONFIG_NODE_HOTPLUG_EMU
>> +static ssize_t store_nodes_probe(struct sysdev_class *class,
>> +                                 struct sysdev_class_attribute *attr,
>> +                                 const char *buf, size_t count)
>> +{
>> +       long nid;
>> +       int ret;
>> +
>> +       ret = strict_strtol(buf, 0, &nid);
>> +       if (ret == -EINVAL)
>> +               return ret;
>> +
>> +       ret = hotadd_hidden_nodes(nid);
>> +       if (!ret)
>> +               return count;
>> +       else
>> +               return -EIO;
>> +}
>> +#endif
> 
> How about this?
> 
>        err = strict_strtol(buf, 0, &nid);
>        if (err < 0)
>                return err;

other negative value would be odd here.

>        err = hotadd_hidden_nodes(nid);
>        if (err < 0)
>                return err;

hotadd_hidden_nodes could return -EEXIST, which is also odd here, right?

>        return count;
> 
> Thanks,
> Fengguang

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