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

[Jeff Garzik]

Russell King wrote:
> What about the case where the buffer is scatter-gather in nature,
> just like we're so fond of telling driver writers who want to grab
> (eg) 1MB of contiguous kernel memory for video buffers and the like?
> Do we really want to tell driver writers to walk over 1MB of pages,
> page by page, inserting them into the processes page tables via
> remap_area_pages()?

Tell driver writers to call a standard platform function with a 
{dma|mmio|pio|vmalloc} handle+size+len for {dma|mmio|pio|vmalloc} mmap 
setup, and {fault|nopage} handler.  ;-)  IMO they shouldn't have to care 
about the details.

	Jeff



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