http://bugs.freedesktop.org/show_bug.cgi?id=23626





--- Comment #9 from Pauli <[email protected]>  2009-09-14 11:17:06 PST ---
Problem is that user space pointers are invalid in kernel space so we have to
copy and convert the data before entering kernel memory space. That is required
for all pointers passed to drm.

http://www.cs.helsinki.fi/linux/linux-kernel/2002-06/1512.html has explanation
about possible fails in copy.

Which means we need compat ioctl layer to handle the copy. Another option
probably would be converting the user-space pointer to kernel address space but
I could find how to do that.


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