linux-kernel - Re: [PATCH] IB/mad: Use ID allocator routines to allocate agent number

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Message-Id: <E67F0098-C2BC-49F6-AC55-3F9195712D4B@oracle.com>
Date:   Wed, 30 May 2018 22:07:16 +0200
From:   Håkon Bugge <haakon.bugge@...cle.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Hans Westgaard Ry <hans.westgaard.ry@...cle.com>,
        jackm <jackm@....mellanox.co.il>,
        Doug Ledford <dledford@...hat.com>,
        Daniel Jurgens <danielj@...lanox.com>,
        Parav Pandit <parav@...lanox.com>,
        Pravin Shedge <pravin.shedge4linux@...il.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        linux-kernel@...r.kernel.org, Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH] IB/mad: Use ID allocator routines to allocate agent
 number



> On 30 May 2018, at 17:10, Jason Gunthorpe <jgg@...pe.ca> wrote:
> 
> On Wed, May 30, 2018 at 02:22:56PM +0200, Hans Westgaard Ry wrote:
> 
>> We came up with this code snippet which we think handles both preventing
>> immediate re-use and too big/wrapping...
> 
> Isn't this basically the same as idr_alloc_cyclic ?

I draw my statement back. The idr_alloc_cyclic() is the family of idr's that associates a pointer with the bit. Hence, each bit is a bit + 64b.

That's why we ended up with Hans' pseudo code.


Thxs, Håkon


> 
> Jason
> --
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