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

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Date:	Fri, 14 May 2010 12:11:36 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Haicheng Li <haicheng.li@...ux.intel.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

> 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;

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

       return count;

Thanks,
Fengguang
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