Re: map_user_kiobuf question

Jeff Garzik (jgarzik@mandrakesoft.com)
Sat, 06 Nov 1999 04:49:42 -0500

Ingo Molnar wrote:
> On Fri, 5 Nov 1999, Douglas Gilbert wrote:
> > > What type of address gets passed to the third argument of
> > > map_user_kiobuf?
> > >
> > > can I do something like
> > >
> > > addr = vmalloc (size);
> > > ...
> > > map_user_kiobuf (xxx, iobuf, (unsigned long) addr, xxx);
>
> > An address from the user space. For example the 2nd argument of
> > a read() [both the user space system call and a character device
> > read]. Not sure about the vmalloc() aspect.
>
> the address has to be a user-space address. vmalloc()-ed addresses are
> handled differently and separately from user-space addresses.
> map_user_kiobufs right now operate exclusively on user-space virtual
> addresses. Maybe a map_vmalloc_kiobuf() function should be provided as
> well?

Considering that vmalloc'd addresses are global as your other e-mail
mentions, that would be very useful for me at least :)

-- 
Jeff Garzik              | Just once, I wish we would encounter
Building 1024            | an alien menace that wasn't immune to
MandrakeSoft, Inc.       | bullets.   -- The Brigadier, "Dr. Who"


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