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Date: Tue, 31 Dec 2002 15:27:48 -0800
From: Andrew Morton <akpm@digeo.com>
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To: David Brownell <david-b@pacbell.net>
CC: "Adam J. Richter" <adam@yggdrasil.com>, James.Bottomley@steeleye.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] generic device DMA (dma_pool update)
References: <200212312202.OAA10841@adam.yggdrasil.com>
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David Brownell wrote:
> 
>         void *mempool_alloc_td (int mem_flags, void *pool)
>         {
>                 struct td *td;
>                 dma_addr_t dma;
> 
>                 td = dma_pool_alloc (pool, mem_flags, &dma);
>                 if (!td)
>                         return td;
>                 td->td_dma = dma;       /* feed to the hardware */
>                 ... plus other init
>                 return td;
>         }

The existing mempool code can be used to implement this, I believe.  The
pool->alloc callback is passed an opaque void *, and it returns
a void * which can point at any old composite caller-defined blob.
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