linux-kernel - Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

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Date:	Tue, 14 Aug 2007 17:41:25 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>, bob.picco@...com,
	nacc@...ibm.com, kamezawa.hiroyu@...fujitsu.com, mel@...net.ie,
	akpm@...ux-foundation.org, Balbir Singh <balbir@...ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	ckrm-tech <ckrm-tech@...ts.sourceforge.net>
Subject: Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

On Tue, 2007-08-14 at 14:28 -0700, Christoph Lameter wrote:
> On Tue, 14 Aug 2007, Serge E. Hallyn wrote:
> 
> > CONFIG_NODES_SHIFT was unset, so MAX_NUMNODES=1, so
> > node_state() and node_set_state() are dummies.
> 
> Ok then you did not have a NUMA system configured. So its okay for the 
> dummies to ignore the stuff. CONFIG_NODES_SHIFT is a constant and does not 
> change. The first bit is always set.

The first bit [node 0] is only set for the N_ONLINE [and N_POSSIBLE]
mask.  We could add the static init for the other masks, but since
non-numa platforms are going through the __build_all_zonelists, they
might as well set the MEMORY bits explicitly.  Or, maybe you'll
disagree ;-).

Lee


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