[PATCH 49/50] drm: remove dev->vma_count

[Daniel Vetter]

This is just used for a debugfs file, and we can easily reconstruct
this number by just walking the list twice. Which isn't really bad for
a debugfs file anyway.

So let's rip this out.

There's the other issue that the dev->vmalist itself is a bit useless,
since that can be reconstructed with all the memory mapping
information from proc. But remove that is a different topic entirely.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/drm_fops.c |  2 --
 drivers/gpu/drm/drm_info.c | 10 +++++++---
 drivers/gpu/drm/drm_vm.c   |  3 ---
 include/drm/drmP.h         |  1 -
 4 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 330f3dd8e9d0..7f2af9aca038 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -391,8 +391,6 @@ static void drm_legacy_dev_reinit(struct drm_device *dev)
 	if (drm_core_check_feature(dev, DRIVER_MODESET))
 		return;
 
-	atomic_set(&dev->vma_count, 0);
-
 	dev->sigdata.lock = NULL;
 
 	dev->context_flag = 0;
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index 9337f8e210f8..86feedd5e6f6 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -232,14 +232,18 @@ int drm_vma_info(struct seq_file *m, void *data)
 	struct drm_device *dev = node->minor->dev;
 	struct drm_vma_entry *pt;
 	struct vm_area_struct *vma;
+	unsigned long vma_count = 0;
 #if defined(__i386__)
 	unsigned int pgprot;
 #endif
 
 	mutex_lock(&dev->struct_mutex);
-	seq_printf(m, "vma use count: %d, high_memory = %pK, 0x%pK\n",
-		   atomic_read(&dev->vma_count),
-		   high_memory, (void *)(unsigned long)virt_to_phys(high_memory));
+	list_for_each_entry(pt, &dev->vmalist, head)
+		vma_count++;
+
+	seq_printf(m, "vma use count: %lu, high_memory = %pK, 0x%pK\n",
+		   vma_count, high_memory,
+		   (void *)(unsigned long)virt_to_phys(high_memory));
 
 	list_for_each_entry(pt, &dev->vmalist, head) {
 		vma = pt->vma;
diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index ef5540b6b451..24e045c4f531 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -220,7 +220,6 @@ static void drm_vm_shm_close(struct vm_area_struct *vma)
 
 	DRM_DEBUG("0x%08lx,0x%08lx\n",
 		  vma->vm_start, vma->vm_end - vma->vm_start);
-	atomic_dec(&dev->vma_count);
 
 	map = vma->vm_private_data;
 
@@ -405,7 +404,6 @@ void drm_vm_open_locked(struct drm_device *dev,
 
 	DRM_DEBUG("0x%08lx,0x%08lx\n",
 		  vma->vm_start, vma->vm_end - vma->vm_start);
-	atomic_inc(&dev->vma_count);
 
 	vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL);
 	if (vma_entry) {
@@ -433,7 +431,6 @@ void drm_vm_close_locked(struct drm_device *dev,
 
 	DRM_DEBUG("0x%08lx,0x%08lx\n",
 		  vma->vm_start, vma->vm_end - vma->vm_start);
-	atomic_dec(&dev->vma_count);
 
 	list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
 		if (pt->vma == vma) {
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a61d09b857a5..311d182c521d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1072,7 +1072,6 @@ struct drm_device {
 	/** \name Usage Counters */
 	/*@{ */
 	int open_count;			/**< Outstanding files open, protected by drm_global_lock. */
-	atomic_t vma_count;		/**< Outstanding vma areas open */
 	spinlock_t buf_lock;		/**< For drm_device::buf_use and a few other things. */
 	int buf_use;			/**< Buffers in use -- cannot alloc */
 	atomic_t buf_alloc;		/**< Buffer allocation in progress */
-- 
1.8.4.3