Re: [PATCH 2/2] drm/mm: Pack allocated/scanned boolean into a bitfield

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

On 15/09/2019 19:45, Chris Wilson wrote:
> The ulterior motive to switching the booleans over to bitops is to
> allow use of the allocated flag as a bitlock.

Locked bit usage applies only to DRM_MM_NODE_ALLOCATED_BIT?

Any value in extracting the conversion to calling drm_mm_node_allocated 
ahead of the main patch? Maybe introducing drm_mm_node_scanned_block 
helper in a separate patch as well. Then it's really easy to focus on 
the real change in a last patch which just switches the implementation 
over. But it's not too critical to do this. I don't think patch is that 
big or that it has any potential for regression on it's own to be 
important it is split into smaller chunks. So I think this is "would be 
nice" category of suggestions.

> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
>   drivers/gpu/drm/drm_mm.c                      | 36 +++++++++++--------
>   .../gpu/drm/i915/gem/i915_gem_execbuffer.c    |  6 ++--
>   drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c      |  2 +-
>   drivers/gpu/drm/i915/i915_gem.c               | 16 ++++-----
>   drivers/gpu/drm/i915/i915_gem_evict.c         |  2 +-
>   drivers/gpu/drm/i915/i915_vma.c               |  2 +-
>   drivers/gpu/drm/i915/i915_vma.h               |  4 +--
>   drivers/gpu/drm/selftests/test-drm_mm.c       | 14 ++++----
>   drivers/gpu/drm/vc4/vc4_crtc.c                |  2 +-
>   drivers/gpu/drm/vc4/vc4_hvs.c                 |  2 +-
>   drivers/gpu/drm/vc4/vc4_plane.c               |  4 +--
>   include/drm/drm_mm.h                          |  7 ++--
>   12 files changed, 52 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
> index 4581c5387372..211967006cec 100644
> --- a/drivers/gpu/drm/drm_mm.c
> +++ b/drivers/gpu/drm/drm_mm.c
> @@ -174,7 +174,7 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,
>   
>   	node->__subtree_last = LAST(node);
>   
> -	if (hole_node->allocated) {
> +	if (drm_mm_node_allocated(hole_node)) {
>   		rb = &hole_node->rb;
>   		while (rb) {
>   			parent = rb_entry(rb, struct drm_mm_node, rb);
> @@ -424,9 +424,9 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node)
>   
>   	node->mm = mm;
>   
> +	__set_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
>   	list_add(&node->node_list, &hole->node_list);
>   	drm_mm_interval_tree_add_node(hole, node);
> -	node->allocated = true;
>   	node->hole_size = 0;
>   
>   	rm_hole(hole);
> @@ -543,9 +543,9 @@ int drm_mm_insert_node_in_range(struct drm_mm * const mm,
>   		node->color = color;
>   		node->hole_size = 0;
>   
> +		__set_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
>   		list_add(&node->node_list, &hole->node_list);
>   		drm_mm_interval_tree_add_node(hole, node);
> -		node->allocated = true;
>   
>   		rm_hole(hole);
>   		if (adj_start > hole_start)
> @@ -561,6 +561,11 @@ int drm_mm_insert_node_in_range(struct drm_mm * const mm,
>   }
>   EXPORT_SYMBOL(drm_mm_insert_node_in_range);
>   
> +static inline bool drm_mm_node_scanned_block(const struct drm_mm_node *node)
> +{
> +	return test_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
> +}
> +
>   /**
>    * drm_mm_remove_node - Remove a memory node from the allocator.
>    * @node: drm_mm_node to remove
> @@ -574,8 +579,8 @@ void drm_mm_remove_node(struct drm_mm_node *node)
>   	struct drm_mm *mm = node->mm;
>   	struct drm_mm_node *prev_node;
>   
> -	DRM_MM_BUG_ON(!node->allocated);
> -	DRM_MM_BUG_ON(node->scanned_block);
> +	DRM_MM_BUG_ON(!drm_mm_node_allocated(node));
> +	DRM_MM_BUG_ON(drm_mm_node_scanned_block(node));
>   
>   	prev_node = list_prev_entry(node, node_list);
>   
> @@ -584,11 +589,12 @@ void drm_mm_remove_node(struct drm_mm_node *node)
>   
>   	drm_mm_interval_tree_remove(node, &mm->interval_tree);
>   	list_del(&node->node_list);
> -	node->allocated = false;
>   
>   	if (drm_mm_hole_follows(prev_node))
>   		rm_hole(prev_node);
>   	add_hole(prev_node);
> +
> +	clear_bit_unlock(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
>   }
>   EXPORT_SYMBOL(drm_mm_remove_node);
>   
> @@ -605,7 +611,7 @@ void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
>   {
>   	struct drm_mm *mm = old->mm;
>   
> -	DRM_MM_BUG_ON(!old->allocated);
> +	DRM_MM_BUG_ON(!drm_mm_node_allocated(old));
>   
>   	*new = *old;
>   
> @@ -622,8 +628,7 @@ void drm_mm_replace_node(struct drm_mm_node *old, struct drm_mm_node *new)
>   				&mm->holes_addr);
>   	}
>   
> -	old->allocated = false;
> -	new->allocated = true;
> +	clear_bit_unlock(DRM_MM_NODE_ALLOCATED_BIT, &old->flags);
>   }
>   EXPORT_SYMBOL(drm_mm_replace_node);
>   
> @@ -731,9 +736,9 @@ bool drm_mm_scan_add_block(struct drm_mm_scan *scan,
>   	u64 adj_start, adj_end;
>   
>   	DRM_MM_BUG_ON(node->mm != mm);
> -	DRM_MM_BUG_ON(!node->allocated);
> -	DRM_MM_BUG_ON(node->scanned_block);
> -	node->scanned_block = true;
> +	DRM_MM_BUG_ON(!drm_mm_node_allocated(node));
> +	DRM_MM_BUG_ON(drm_mm_node_scanned_block(node));
> +	__set_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
>   	mm->scan_active++;
>   
>   	/* Remove this block from the node_list so that we enlarge the hole
> @@ -818,8 +823,7 @@ bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
>   	struct drm_mm_node *prev_node;
>   
>   	DRM_MM_BUG_ON(node->mm != scan->mm);
> -	DRM_MM_BUG_ON(!node->scanned_block);
> -	node->scanned_block = false;
> +	DRM_MM_BUG_ON(!drm_mm_node_scanned_block(node));
>   
>   	DRM_MM_BUG_ON(!node->mm->scan_active);
>   	node->mm->scan_active--;
> @@ -837,6 +841,8 @@ bool drm_mm_scan_remove_block(struct drm_mm_scan *scan,
>   		      list_next_entry(node, node_list));
>   	list_add(&node->node_list, &prev_node->node_list);
>   
> +	__clear_bit(DRM_MM_NODE_SCANNED_BIT, &node->flags);
> +
>   	return (node->start + node->size > scan->hit_start &&
>   		node->start < scan->hit_end);
>   }
> @@ -917,7 +923,7 @@ void drm_mm_init(struct drm_mm *mm, u64 start, u64 size)
>   
>   	/* Clever trick to avoid a special case in the free hole tracking. */
>   	INIT_LIST_HEAD(&mm->head_node.node_list);
> -	mm->head_node.allocated = false;
> +	mm->head_node.flags = 0;
>   	mm->head_node.mm = mm;
>   	mm->head_node.start = start + size;
>   	mm->head_node.size = -size;
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 27dbcb508055..c049199a1df5 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -906,7 +906,7 @@ static void reloc_cache_init(struct reloc_cache *cache,
>   	cache->use_64bit_reloc = HAS_64BIT_RELOC(i915);
>   	cache->has_fence = cache->gen < 4;
>   	cache->needs_unfenced = INTEL_INFO(i915)->unfenced_needs_alignment;
> -	cache->node.allocated = false;
> +	cache->node.flags = 0;
>   	cache->ce = NULL;
>   	cache->rq = NULL;
>   	cache->rq_size = 0;
> @@ -968,7 +968,7 @@ static void reloc_cache_reset(struct reloc_cache *cache)
>   		intel_gt_flush_ggtt_writes(ggtt->vm.gt);
>   		io_mapping_unmap_atomic((void __iomem *)vaddr);
>   
> -		if (cache->node.allocated) {
> +		if (drm_mm_node_allocated(&cache->node)) {
>   			ggtt->vm.clear_range(&ggtt->vm,
>   					     cache->node.start,
>   					     cache->node.size);
> @@ -1061,7 +1061,7 @@ static void *reloc_iomap(struct drm_i915_gem_object *obj,
>   	}
>   
>   	offset = cache->node.start;
> -	if (cache->node.allocated) {
> +	if (drm_mm_node_allocated(&cache->node)) {
>   		ggtt->vm.insert_page(&ggtt->vm,
>   				     i915_gem_object_get_dma_address(obj, page),
>   				     offset, I915_CACHE_NONE, 0);
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
> index 296a82603be0..07fc6f28abcd 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
> @@ -401,7 +401,7 @@ static u32 uc_fw_ggtt_offset(struct intel_uc_fw *uc_fw, struct i915_ggtt *ggtt)
>   {
>   	struct drm_mm_node *node = &ggtt->uc_fw;
>   
> -	GEM_BUG_ON(!node->allocated);
> +	GEM_BUG_ON(!drm_mm_node_allocated(node));
>   	GEM_BUG_ON(upper_32_bits(node->start));
>   	GEM_BUG_ON(upper_32_bits(node->start + node->size - 1));
>   
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 2da9544fa9a4..b8f7fe311b0a 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -351,12 +351,12 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
>   					       PIN_NOEVICT);
>   	if (!IS_ERR(vma)) {
>   		node.start = i915_ggtt_offset(vma);
> -		node.allocated = false;
> +		node.flags = 0;
>   	} else {
>   		ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
>   		if (ret)
>   			goto out_unlock;
> -		GEM_BUG_ON(!node.allocated);
> +		GEM_BUG_ON(!drm_mm_node_allocated(&node));
>   	}
>   
>   	mutex_unlock(&i915->drm.struct_mutex);
> @@ -393,7 +393,7 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
>   		unsigned page_offset = offset_in_page(offset);
>   		unsigned page_length = PAGE_SIZE - page_offset;
>   		page_length = remain < page_length ? remain : page_length;
> -		if (node.allocated) {
> +		if (drm_mm_node_allocated(&node)) {
>   			ggtt->vm.insert_page(&ggtt->vm,
>   					     i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT),
>   					     node.start, I915_CACHE_NONE, 0);
> @@ -415,7 +415,7 @@ i915_gem_gtt_pread(struct drm_i915_gem_object *obj,
>   	i915_gem_object_unlock_fence(obj, fence);
>   out_unpin:
>   	mutex_lock(&i915->drm.struct_mutex);
> -	if (node.allocated) {
> +	if (drm_mm_node_allocated(&node)) {
>   		ggtt->vm.clear_range(&ggtt->vm, node.start, node.size);
>   		remove_mappable_node(&node);
>   	} else {
> @@ -561,12 +561,12 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
>   					       PIN_NOEVICT);
>   	if (!IS_ERR(vma)) {
>   		node.start = i915_ggtt_offset(vma);
> -		node.allocated = false;
> +		node.flags = 0;
>   	} else {
>   		ret = insert_mappable_node(ggtt, &node, PAGE_SIZE);
>   		if (ret)
>   			goto out_rpm;
> -		GEM_BUG_ON(!node.allocated);
> +		GEM_BUG_ON(!drm_mm_node_allocated(&node));
>   	}
>   
>   	mutex_unlock(&i915->drm.struct_mutex);
> @@ -604,7 +604,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
>   		unsigned int page_offset = offset_in_page(offset);
>   		unsigned int page_length = PAGE_SIZE - page_offset;
>   		page_length = remain < page_length ? remain : page_length;
> -		if (node.allocated) {
> +		if (drm_mm_node_allocated(&node)) {
>   			/* flush the write before we modify the GGTT */
>   			intel_gt_flush_ggtt_writes(ggtt->vm.gt);
>   			ggtt->vm.insert_page(&ggtt->vm,
> @@ -636,7 +636,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
>   out_unpin:
>   	mutex_lock(&i915->drm.struct_mutex);
>   	intel_gt_flush_ggtt_writes(ggtt->vm.gt);
> -	if (node.allocated) {
> +	if (drm_mm_node_allocated(&node)) {
>   		ggtt->vm.clear_range(&ggtt->vm, node.start, node.size);
>   		remove_mappable_node(&node);
>   	} else {
> diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
> index e76c9da9992d..8c1e04f402bc 100644
> --- a/drivers/gpu/drm/i915/i915_gem_evict.c
> +++ b/drivers/gpu/drm/i915/i915_gem_evict.c
> @@ -299,7 +299,7 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
>   			break;
>   		}
>   
> -		GEM_BUG_ON(!node->allocated);
> +		GEM_BUG_ON(!drm_mm_node_allocated(node));
>   		vma = container_of(node, typeof(*vma), node);
>   
>   		/* If we are using coloring to insert guard pages between
> diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> index 411047d6a909..d10614091bb9 100644
> --- a/drivers/gpu/drm/i915/i915_vma.c
> +++ b/drivers/gpu/drm/i915/i915_vma.c
> @@ -795,7 +795,7 @@ void i915_vma_reopen(struct i915_vma *vma)
>   
>   static void __i915_vma_destroy(struct i915_vma *vma)
>   {
> -	GEM_BUG_ON(vma->node.allocated);
> +	GEM_BUG_ON(drm_mm_node_allocated(&vma->node));
>   	GEM_BUG_ON(vma->fence);
>   
>   	mutex_lock(&vma->vm->mutex);
> diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
> index 8bcb5812c446..e49b199f7de7 100644
> --- a/drivers/gpu/drm/i915/i915_vma.h
> +++ b/drivers/gpu/drm/i915/i915_vma.h
> @@ -228,7 +228,7 @@ static inline bool i915_vma_is_closed(const struct i915_vma *vma)
>   static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
>   {
>   	GEM_BUG_ON(!i915_vma_is_ggtt(vma));
> -	GEM_BUG_ON(!vma->node.allocated);
> +	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
>   	GEM_BUG_ON(upper_32_bits(vma->node.start));
>   	GEM_BUG_ON(upper_32_bits(vma->node.start + vma->node.size - 1));
>   	return lower_32_bits(vma->node.start);
> @@ -390,7 +390,7 @@ static inline bool i915_vma_is_bound(const struct i915_vma *vma,
>   static inline bool i915_node_color_differs(const struct drm_mm_node *node,
>   					   unsigned long color)
>   {
> -	return node->allocated && node->color != color;
> +	return drm_mm_node_allocated(node) && node->color != color;
>   }
>   
>   /**
> diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
> index 388f9844f4ba..9aabe82dcd3a 100644
> --- a/drivers/gpu/drm/selftests/test-drm_mm.c
> +++ b/drivers/gpu/drm/selftests/test-drm_mm.c
> @@ -854,7 +854,7 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
>   
>   	if (start > 0) {
>   		node = __drm_mm_interval_first(mm, 0, start - 1);
> -		if (node->allocated) {
> +		if (drm_mm_node_allocated(node)) {
>   			pr_err("node before start: node=%llx+%llu, start=%llx\n",
>   			       node->start, node->size, start);
>   			return false;
> @@ -863,7 +863,7 @@ static bool assert_contiguous_in_range(struct drm_mm *mm,
>   
>   	if (end < U64_MAX) {
>   		node = __drm_mm_interval_first(mm, end, U64_MAX);
> -		if (node->allocated) {
> +		if (drm_mm_node_allocated(node)) {
>   			pr_err("node after end: node=%llx+%llu, end=%llx\n",
>   			       node->start, node->size, end);
>   			return false;
> @@ -1156,12 +1156,12 @@ static void show_holes(const struct drm_mm *mm, int count)
>   		struct drm_mm_node *next = list_next_entry(hole, node_list);
>   		const char *node1 = NULL, *node2 = NULL;
>   
> -		if (hole->allocated)
> +		if (drm_mm_node_allocated(hole))
>   			node1 = kasprintf(GFP_KERNEL,
>   					  "[%llx + %lld, color=%ld], ",
>   					  hole->start, hole->size, hole->color);
>   
> -		if (next->allocated)
> +		if (drm_mm_node_allocated(next))
>   			node2 = kasprintf(GFP_KERNEL,
>   					  ", [%llx + %lld, color=%ld]",
>   					  next->start, next->size, next->color);
> @@ -1900,18 +1900,18 @@ static void separate_adjacent_colors(const struct drm_mm_node *node,
>   				     u64 *start,
>   				     u64 *end)
>   {
> -	if (node->allocated && node->color != color)
> +	if (drm_mm_node_allocated(node) && node->color != color)
>   		++*start;
>   
>   	node = list_next_entry(node, node_list);
> -	if (node->allocated && node->color != color)
> +	if (drm_mm_node_allocated(node) && node->color != color)
>   		--*end;
>   }
>   
>   static bool colors_abutt(const struct drm_mm_node *node)
>   {
>   	if (!drm_mm_hole_follows(node) &&
> -	    list_next_entry(node, node_list)->allocated) {
> +	    drm_mm_node_allocated(list_next_entry(node, node_list))) {
>   		pr_err("colors abutt; %ld [%llx + %llx] is next to %ld [%llx + %llx]!\n",
>   		       node->color, node->start, node->size,
>   		       list_next_entry(node, node_list)->color,
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index f1f0a7c87771..b00e20f5ce05 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -994,7 +994,7 @@ static void vc4_crtc_destroy_state(struct drm_crtc *crtc,
>   	struct vc4_dev *vc4 = to_vc4_dev(crtc->dev);
>   	struct vc4_crtc_state *vc4_state = to_vc4_crtc_state(state);
>   
> -	if (vc4_state->mm.allocated) {
> +	if (drm_mm_node_allocated(&vc4_state->mm)) {
>   		unsigned long flags;
>   
>   		spin_lock_irqsave(&vc4->hvs->mm_lock, flags);
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index 9936b15d0bf1..5a43659da319 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -315,7 +315,7 @@ static void vc4_hvs_unbind(struct device *dev, struct device *master,
>   	struct drm_device *drm = dev_get_drvdata(master);
>   	struct vc4_dev *vc4 = drm->dev_private;
>   
> -	if (vc4->hvs->mitchell_netravali_filter.allocated)
> +	if (drm_mm_node_allocated(&vc4->hvs->mitchell_netravali_filter))
>   		drm_mm_remove_node(&vc4->hvs->mitchell_netravali_filter);
>   
>   	drm_mm_takedown(&vc4->hvs->dlist_mm);
> diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
> index 5e5f90810aca..4934127f0d76 100644
> --- a/drivers/gpu/drm/vc4/vc4_plane.c
> +++ b/drivers/gpu/drm/vc4/vc4_plane.c
> @@ -178,7 +178,7 @@ static void vc4_plane_destroy_state(struct drm_plane *plane,
>   	struct vc4_dev *vc4 = to_vc4_dev(plane->dev);
>   	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
>   
> -	if (vc4_state->lbm.allocated) {
> +	if (drm_mm_node_allocated(&vc4_state->lbm)) {
>   		unsigned long irqflags;
>   
>   		spin_lock_irqsave(&vc4->hvs->mm_lock, irqflags);
> @@ -557,7 +557,7 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
>   	/* Allocate the LBM memory that the HVS will use for temporary
>   	 * storage due to our scaling/format conversion.
>   	 */
> -	if (!vc4_state->lbm.allocated) {
> +	if (!drm_mm_node_allocated(&vc4_state->lbm)) {
>   		int ret;
>   
>   		spin_lock_irqsave(&vc4->hvs->mm_lock, irqflags);
> diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
> index 2c3bbb43c7d1..d7939c054259 100644
> --- a/include/drm/drm_mm.h
> +++ b/include/drm/drm_mm.h
> @@ -168,8 +168,9 @@ struct drm_mm_node {
>   	struct rb_node rb_hole_addr;
>   	u64 __subtree_last;
>   	u64 hole_size;
> -	bool allocated : 1;
> -	bool scanned_block : 1;
> +	unsigned long flags;
> +#define DRM_MM_NODE_ALLOCATED_BIT	0

Document here the rules for manipulating this bit would be good.

> +#define DRM_MM_NODE_SCANNED_BIT		1
>   #ifdef CONFIG_DRM_DEBUG_MM
>   	depot_stack_handle_t stack;
>   #endif
> @@ -253,7 +254,7 @@ struct drm_mm_scan {
>    */
>   static inline bool drm_mm_node_allocated(const struct drm_mm_node *node)
>   {
> -	return node->allocated;
> +	return test_bit(DRM_MM_NODE_ALLOCATED_BIT, &node->flags);
>   }
>   
>   /**

Regards,

Tvrtko
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