Messages in this thread |  | | Date | Wed, 2 May 2001 16:34:42 +0200 (MET DST) | From | Bjorn Wesen <> | Subject | Re: Problem with map_user_kiobuf() not mapping to physical memory |
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On Wed, 2 May 2001, Terry Barnaby wrote: > However, I note that if the user just mallocs memory and does not access > it > (No physical memory pages created) and then passes this virtual address > space > to the driver which performs a map_user_kiobuf() on it, the resulting > kiobuf > structure has all of the pagelist[] physical address entries set to the > same value > and the maplist[] entries set to 0. The devices access to this memory > now > causes system problems. > Is map_user_kiobuf() working correctly ? > Should I call some function to map the virtual address space into > physical memory > or at least pages before I call map_user_kiobuf() ?
No.. but you might just have done something wrong.
See the example in arch/cris/drivers/examples/kiobuftest.c
(that example does not deallocate the vectors properly IIRC, but the actual kiobuf mapping sequence should work)
/BW
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