linux-kernel - idr: IDs guaranteed to be less than 1<<31? (was Re: [PATCH] firewire: us an idr rather than a linked list for resources)

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Date:	Mon, 24 Nov 2008 20:09:01 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jay Fenlason <fenlason@...hat.com>
CC:	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: idr: IDs guaranteed to be less than 1<<31? (was Re: [PATCH] firewire:
 us an idr rather than a linked list for resources)

Jay Fenlason wrote at linux1394-devel:
> As mentioned in the comments, there is a theoretical problem with this
> code if someone manages to allocate 2^31 resources on a 32-bit
> machine, or 2^32+1 resources on a 64+-bit machine.

The kerneldoc of idr_get_new() says that we only get IDs in the range of
0...0x7fffffff.  But is this true with 64bit kernels?
-- 
Stefan Richter
-=====-==--- =-== ==---
http://arcgraph.de/sr/
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