linux-kernel - [PATCH] drm/i915: change node clearing from memset to initialization

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Date:   Sat, 16 Apr 2022 13:23:25 -0400
From:   Tom Rix <trix@...hat.com>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...ux.ie, daniel@...ll.ch
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] drm/i915: change node clearing from memset to initialization

In insert_mappable_node(), the parameter node is
cleared late in node's use with memset.
insert_mappable_node() is a singleton, called only
from i915_gem_gtt_prepare() which itself is only
called by i915_gem_gtt_pread() and
i915_gem_gtt_pwrite_fast() where the definition of
node originates.

Instead of using memset, initialize node to 0 at it's
definitions.  And remove unneeded clearing of the flags
element.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2e10187cd0a0..7dbd0b325c43 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -69,7 +69,6 @@ insert_mappable_node(struct i915_ggtt *ggtt, struct drm_mm_node *node, u32 size)
 	if (err)
 		return err;
 
-	memset(node, 0, sizeof(*node));
 	err = drm_mm_insert_node_in_range(&ggtt->vm.mm, node,
 					  size, 0, I915_COLOR_UNEVICTABLE,
 					  0, ggtt->mappable_end,
@@ -328,7 +327,6 @@ static struct i915_vma *i915_gem_gtt_prepare(struct drm_i915_gem_object *obj,
 		goto err_ww;
 	} else if (!IS_ERR(vma)) {
 		node->start = i915_ggtt_offset(vma);
-		node->flags = 0;
 	} else {
 		ret = insert_mappable_node(ggtt, node, PAGE_SIZE);
 		if (ret)
@@ -381,7 +379,7 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
 	intel_wakeref_t wakeref;
-	struct drm_mm_node node;
+	struct drm_mm_node node = {};
 	void __user *user_data;
 	struct i915_vma *vma;
 	u64 remain, offset;
@@ -538,7 +536,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
 	struct i915_ggtt *ggtt = to_gt(i915)->ggtt;
 	struct intel_runtime_pm *rpm = &i915->runtime_pm;
 	intel_wakeref_t wakeref;
-	struct drm_mm_node node;
+	struct drm_mm_node node = {};
 	struct i915_vma *vma;
 	u64 remain, offset;
 	void __user *user_data;
-- 
2.27.0