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Subject: Re: your mail
To: sanket.rathi@cdac.ernet.in (Sanket Rathi)
Date: Thu, 16 May 2002 19:05:43 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox),
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> No actually i don't want that for DMA it is for diffrent requirment.
> actually in our device there is a page table in device which have
> virtual to physical address translation we save virtual address in device
> and corresponding physical address. but we can store only upto 44 bit 
> information of virtual address thats why i want that.

Still read Documentation/DMA-mapping.txt

Whether its DMA or not you are going to need to keep the allocations below
44bits and thats what the DMA allocators do