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

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Date:	Sun, 10 Feb 2013 21:19:10 +0000
From:	"Hefty, Sean" <sean.hefty@...el.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"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

> So, if you want a cyclic allocation, the allocation should be tried in
> [start, END) and then [0, start); otherwise, after the allocation
> wraps for the first time, as the closer the starting point gets to
> END, the chance of not finding a vacant slot in [start, END) goes
> higher.  When @start equals END - 1 for the second time, if the first
> END - 1 allocation is still around, you'll get -ENOSPC.

Got it - thanks.  I'll make a note to fix this.
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