Re: Problem with remap_page_range/mmap

Christoph Hellwig
2004-03-26T09:46:59Z

On Fri, Mar 26, 2004 at 10:36:19AM +0100, Christian Leber wrote:
> It also didn´t work with PG_reserved.
> What would be the good idea? I need at least 8 at least 4MB (2MB are enough for 2.4)
> big physical memory pieces for DMA, mapped to userspace.
>
> What is the reason why it doesn´t work? There seems to be no special
> remap_page_range for ia64.

Put the page structs into an array and return them from ->nopage. The
kernel pagefault code will set up the ptes for you.

Now actually getting 4MB of continguous memory is a different issue..

I'm surprised you actually managed to get the allocation to succeed.