Jens Axboe <[email protected]> wrote:
> > > It's a bit of a sledge hammer... Since get_user_pages() appears to work
> > > on nummu, we can just disable the vmsplice-to-userspace bits and leave
> > > the (working) vmsplice-from-userspace in place.
> >
> > That sounds about right. I don't think you can do the latter without
> > an MMU, but I may be wrong about what it does.
>
> You mean the former? The latter is vmsplice() filling a pipe with user
> pages, using get_user_pages() to set them up. And that looks like it
> should work on nommu.
>
> The former is vmsplice() using mmap like functionality to map pages into
> a user vma.
Sorry, yes. The former.
David
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