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SubjectRe: mapping user space buffer to kernel address space


On Fri, 20 Oct 2000, Andrea Arcangeli wrote:

> On Thu, Oct 19, 2000 at 05:16:14PM -0400, Jeff Garzik wrote:
> > solution is really elegant. Excluding all the debug code and assertions
> > I stick in there, the guts of via audio mmap support went from ~50 lines
> > to ~10.
>
> Was it 50 lines with remap_page_range?

You cannot use remap_page_range() if the pages aren't physically
contiguous.

Face it, Andrea, remap_page_range() is a very limited hack that only works
for a very limited subset of the things that real people want to do. It is
_not_ a generic solution, while the nopage() approach _is_ generic.

Linus

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