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authorChris Wilson <chris@chris-wilson.co.uk>2017-02-04 11:19:13 +0000
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-02-06 16:57:37 +0100
commitbbba96931762bcad8a691dfbf8d1520b71831c3a (patch)
treef3e4eaf765b4b1dcb1207a30532e40f6478e5117 /drivers/gpu/drm/drm_mm.c
parentc5a828148f302c72a137af7f5487a4e52f19f4c9 (diff)
drm: Micro-optimise drm_mm_for_each_node_in_range()
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@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170204111913.12416-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/drm_mm.c')
-rw-r--r--drivers/gpu/drm/drm_mm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 8bfb0b327267..f794089d30ac 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -170,7 +170,7 @@ struct drm_mm_node *
__drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last)
{
return drm_mm_interval_tree_iter_first((struct rb_root *)&mm->interval_tree,
- start, last);
+ start, last) ?: (struct drm_mm_node *)&mm->head_node;
}
EXPORT_SYMBOL(__drm_mm_interval_first);