Re: can device drivers return non-ram via vm_ops->nopage?

[Russell King]

On Sun, Mar 21, 2004 at 03:51:31PM -0800, Linus Torvalds wrote:
> That might be the minimal fix, since it would basically involve:
>  - change whatever offensive "virt_to_page()" calls into 
>    "dma_map_to_page()".
>  - implement "dma_map_to_page()" for all architectures.
> 
> Would that make people happy?

Unfortunately this doesn't make dwmw2 happy - he claims to have machines
which implement dma_alloc_coherent using RAM which doesn't have any
struct page associated with it.

I've already got the interface you suggest above for ARM, and I'd have
taken this further had dwmw2 not chimed in.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core
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