linux-kernel - Re: [PATCH v1 2/6] amso1100: convert to using idr_alloc

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Message-ID: <20130327162755.GC7395@htj.dyndns.org>
Date:	Wed, 27 Mar 2013 09:27:55 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Tom Tucker <tom@...ngridcomputing.com>,
	linux-rdma@...r.kernel.org
Subject: Re: [PATCH v1 2/6] amso1100: convert to using idr_alloc_cyclic

On Wed, Mar 27, 2013 at 09:18:04AM -0400, Jeff Layton wrote:
>  void c2_init_qp_table(struct c2_dev *c2dev)
>  {
>  	spin_lock_init(&c2dev->qp_table.lock);
> -	idr_init(&c2dev->qp_table.idr);
> +	idr_init_cyclic(&c2dev->qp_table.idr, 0);
>  }

Why is this necessary?  In general, why is idr_init_cyclic()
necessary?

Thanks.

-- 
tejun
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