Hi guys,
Michel once submitted a patch to fix triggering this BUG_ON in
ttm_tt_swapout():
BUG_ON(ttm->caching_state != tt_cached);
Now my question is does anybody know why we have that in the first place?
The only problematic thing I can see is calling copy_highpage() and that
one is just doing a kmap_atomic()/kunmap_atomic() on the source and
destination.
I can't see why it should be problematic for this temporary mapping to
be cached instead of uncached or WC?
Does anybody has any idea?
Thanks,
Christian.
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