linux-kernel - RE: [PATCH 2/6] idr: remove MAX_IDR_MASK and move left MAX_IDR

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Date:	Fri, 8 Feb 2013 22:09:13 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jean Delvare <khali@...ux-fr.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Roland Dreier <roland@...nel.org>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"Marciniszyn, Mike" <mike.marciniszyn@...el.com>,
	Jack Morgenstein <jackm@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: RE: [PATCH 2/6] idr: remove MAX_IDR_MASK and move left MAX_IDR_*
 into idr.c

> * drivers/infiniband/core/cm.c:cm_alloc_id()
>   drivers/infiniband/hw/mlx4/cm.c:id_map_alloc()
> 
>   Used to wrap cyclic @start.  Can be replaced with max(next, 0).
>   Note that this type of cyclic allocation using idr is buggy.  These
>   are prone to spurious -ENOSPC failure after the first wraparound.

The replacement code looks fine, but can you explain why the use is buggy?
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