[PATCH 0/2] ttm patches for drm-next v2

[Thomas Hellstrom]

These patches attempt to optimize the delayed destroy handling.
The first patch removes the need for the newly introduced mem_put_locked
callback. The second patch optimizes the delayed buffer destruction somewhat,
but has not yet seen extensive testing.

v2: As Dave Airlie pointed out, we actually forgot to drop the spinlock before
calling ttm_bo_cleanup_memtype_use