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

3 files changed, 11 insertions, 6 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);
 
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index 1e71bc182ca9..2958f596081e 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -839,16 +839,18 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
                 n++;
         }
 
-        drm_mm_for_each_node_in_range(node, mm, 0, start) {
-                if (node) {
+        if (start > 0) {
+                node = __drm_mm_interval_first(mm, 0, start - 1);
+                if (node->allocated) {
                         pr_err("node before start: node=%llx+%llu, start=%llx\n",
                                node->start, node->size, start);
                         return false;
                 }
         }
 
-        drm_mm_for_each_node_in_range(node, mm, end, U64_MAX) {
-                if (node) {
+        if (end < U64_MAX) {
+                node = __drm_mm_interval_first(mm, end, U64_MAX);
+                if (node->allocated) {
                         pr_err("node after end: node=%llx+%llu, end=%llx\n",
                                node->start, node->size, end);
                         return false;
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index d81b0ba9921f..f262da180117 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -459,10 +459,13 @@ __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last);
  * but using the internal interval tree to accelerate the search for the
  * starting node, and so not safe against removal of elements. It assumes
  * that @end is within (or is the upper limit of) the drm_mm allocator.
+ * If [@start, @end] are beyond the range of the drm_mm, the iterator may walk
+ * over the special _unallocated_ &drm_mm.head_node, and may even continue
+ * indefinitely.
  */
 #define drm_mm_for_each_node_in_range(node__, mm__, start__, end__)     \
         for (node__ = __drm_mm_interval_first((mm__), (start__), (end__)-1); \
-             node__ && node__->start < (end__);                         \
+             node__->start < (end__);                                   \
              node__ = list_next_entry(node__, node_list))
 
 void drm_mm_scan_init_with_range(struct drm_mm_scan *scan,