Messages in this thread | | | Date | Sat, 6 Nov 1999 11:44:19 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: map_user_kiobuf question |
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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?
-- mingo
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