[PATCH] drm: Only evict the blocks required to create the requested hole

[Daniel Vetter]

On Wed, Dec 19, 2012 at 04:51:06PM +0000, Chris Wilson wrote:
> Avoid clobbering adjacent blocks if they happen to expire earlier and
> amalgamate together to form the requested hole.
> 
> In passing this fixes a regression from
> commit ea7b1dd44867e9cd6bac67e7c9fc3f128b5b255c
> Author: Daniel Vetter <daniel.vetter at ffwll.ch>
> Date:   Fri Feb 18 17:59:12 2011 +0100
> 
>     drm: mm: track free areas implicitly
> 
> which swaps the end address for size (with a potential overflow) and
> effectively causes the eviction code to clobber almost all earlier
> buffers above the evictee.
> 
> v2: Check the original hole not the adjusted as the coloring may confuse
> us when later searching for the overlapping nodes. Also make sure that
> we do apply the range restriction and color adjustment in the same
> order for both scanning, searching and insertion.
> 
> v3: Send the version that was actually tested.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>

Picked up for -fixes with bugzilla link and Norberts tested-by added,
thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch