Re: Problem with map_user_kiobuf() not mapping to physical memory

Gerd Knorr (kraxel@bytesex.org)
2 May 2001 19:17:51 GMT

> 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 ?

Yes, it is. You have to lock down the pages for I/O with
lock_kiovec() before using the maplist. The locking will
also fault the pages if needed.

Gerd

-- 
sigfault (core dumped)
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