linux-kernel - Re: [5/7, v9] NUMA Hotplug Emulator: Support cpu probe/release in x86

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Message-ID: <20101223043015.GA13976@shaohui>
Date:	Thu, 23 Dec 2010 12:30:15 +0800
From:	Shaohui Zheng <shaohui.zheng@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	shaohui.zheng@...el.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	lethal@...ux-sh.org, ak@...ux.intel.com, rientjes@...gle.com,
	dave@...ux.vnet.ibm.com, gregkh@...e.de,
	Ingo Molnar <mingo@...e.hu>, Len Brown <len.brown@...el.com>,
	Yinghai Lu <Yinghai.Lu@....COM>, Tejun Heo <tj@...nel.org>,
	Haicheng Li <haicheng.li@...el.com>
Subject: Re: [5/7, v9] NUMA Hotplug Emulator: Support cpu probe/release in
 x86_64

On Wed, Dec 22, 2010 at 09:28:04PM -0800, Andrew Morton wrote:
> On Thu, 23 Dec 2010 10:24:28 +0800 Shaohui Zheng <shaohui.zheng@...ux.intel.com> wrote:
> 
> > > 
> > > Why *does* it check `count' and then not use it?
> > > 
> > 
> > it is a tricky thing. When I debug it under a Virtual Machine, If I do a cpu
> > probe via sysfs cpu/probe interface, The function arch_cpu_probe will be called
> > __three__ times, but only one call is valid, so I add a check on `count` to
> > ignore the invalid calls.
> 
> hm, why does it get called three times?  Is that something which
> can/should be fixed in callers rather than in the callee?

It might be a bug in the caller, but just guess currently. I will investigate it.

-- 
Thanks & Regards,
Shaohui

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