linux-kernel - Re: Can Linux live without DMA zone?

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Date:	Thu, 02 Nov 2006 16:26:20 -0500
From:	Phillip Susi <psusi@....rr.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Jun Sun <jsun@...sun.net>, linux-kernel@...r.kernel.org
Subject: Re: Can Linux live without DMA zone?

Arjan van de Ven wrote:
> that's for the 32 bit boundary. THe problem is that there are 31, 30, 28
> and 26 bit devices as well, and those are in more trouble, and will
> eventually fall back to GFP_DMA (inside the x86 PCI code; the driver
> just uses the pci dma allocation routines) if they can't get suitable
> memory otherwise....
> 
> It's all nice in theory. But then there is the reality that not all
> devices are nice pci device that implement the entire spec;)
> 

Right, but doesn't the bounce/allocation routine take as a parameter the 
limit that the device can handle?  If the device can handle 28 bit 
addresses, then the kernel should not limit it to only 24 bits.
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