[PATCH] drm: Micro-optimise drm_mm_for_each_node_in_range()

[Joonas Lahtinen]

On la, 2017-02-04 at 11:19 +0000, Chris Wilson wrote:
> As we require valid start/end parameters, we can replace the initial
> potential NULL with a pointer to the drm_mm.head_node and so reduce the
> test on every iteration from a NULL + address comparison to just an
> address comparison.
> 
> add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-26 (-26)
> function                                     old     new   delta
> i915_gem_evict_for_node                      719     693     -26
> 
> (No other users outside of the test harness.)
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Slightly confused by the mixing of [start, end] and [start, end).

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation