linux-kernel - Re: [RFC][PATCH 02/26] mm, mpol: Remove NUMA_INTERLEAVE

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Date:	Fri, 06 Jul 2012 17:00:48 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dan Smith <danms@...ibm.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 02/26] mm, mpol: Remove NUMA_INTERLEAVE_HIT

On Fri, 2012-07-06 at 23:54 +0900, Kyungmin Park wrote:
> >  static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy,
> >         int nd)
> >  {
> >         switch (policy->mode) {
> > +       case MPOL_INTERLEAVE:
> > +               nd = interleave_nodes(policy);
> Jut nitpick,
> Original code also uses the 'unsigned nid' but now it assigned
> 'unsigned nid' to 'int nd' at here. does it right? 

node id is generally signed, we use -1 as a special value indicating no
node preference in a number of places. Not sure why it was unsigned
here. Also I think even SGI isn't anywhere near 2^31 nodes.
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