drm/ttm: drop ttm->dummy_read_page

Only used by the AGP backend and there it can be easily accessed using
ttm->bdev->glob.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index b372d8d..e38e6db 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -969,8 +969,7 @@ static struct ttm_backend_func amdgpu_backend_func = {
 };
 
 static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
-                                   unsigned long size, uint32_t page_flags,
-                                   struct page *dummy_read_page)
+                                   unsigned long size, uint32_t page_flags)
 {
        struct amdgpu_device *adev;
        struct amdgpu_ttm_tt *gtt;
@@ -983,7 +982,7 @@ static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
        }
        gtt->ttm.ttm.func = &amdgpu_backend_func;
        gtt->adev = adev;
-       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
                kfree(gtt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index 68b9c55..77d2035 100644 (file)
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -200,8 +200,7 @@ static struct ttm_backend_func ast_tt_backend_func = {
 
 
 static struct ttm_tt *ast_ttm_tt_create(struct ttm_bo_device *bdev,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page)
+                                unsigned long size, uint32_t page_flags)
 {
        struct ttm_tt *tt;
 
@@ -209,7 +208,7 @@ static struct ttm_tt *ast_ttm_tt_create(struct ttm_bo_device *bdev,
        if (tt == NULL)
                return NULL;
        tt->func = &ast_tt_backend_func;
-       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(tt, bdev, size, page_flags)) {
                kfree(tt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 5525b66..96edf00 100644 (file)
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -178,8 +178,7 @@ static struct ttm_backend_func bochs_tt_backend_func = {
 
 static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
                                          unsigned long size,
-                                         uint32_t page_flags,
-                                         struct page *dummy_read_page)
+                                         uint32_t page_flags)
 {
        struct ttm_tt *tt;
 
@@ -187,7 +186,7 @@ static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
        if (tt == NULL)
                return NULL;
        tt->func = &bochs_tt_backend_func;
-       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(tt, bdev, size, page_flags)) {
                kfree(tt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index 33798c7..3413389 100644 (file)
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -200,8 +200,7 @@ static struct ttm_backend_func cirrus_tt_backend_func = {
 
 
 static struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page)
+                                unsigned long size, uint32_t page_flags)
 {
        struct ttm_tt *tt;
 
@@ -209,7 +208,7 @@ static struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
        if (tt == NULL)
                return NULL;
        tt->func = &cirrus_tt_backend_func;
-       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(tt, bdev, size, page_flags)) {
                kfree(tt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
index 0c93349..50e317a 100644 (file)
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -202,8 +202,7 @@ static struct ttm_backend_func hibmc_tt_backend_func = {
 
 static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
                                          unsigned long size,
-                                         u32 page_flags,
-                                         struct page *dummy_read_page)
+                                         u32 page_flags)
 {
        struct ttm_tt *tt;
        int ret;
@@ -214,7 +213,7 @@ static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
                return NULL;
        }
        tt->func = &hibmc_tt_backend_func;
-       ret = ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page);
+       ret = ttm_tt_init(tt, bdev, size, page_flags);
        if (ret) {
                DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
                kfree(tt);

diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index 26e5f14..cd55ff5 100644 (file)
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -200,8 +200,7 @@ static struct ttm_backend_func mgag200_tt_backend_func = {
 
 
 static struct ttm_tt *mgag200_ttm_tt_create(struct ttm_bo_device *bdev,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page)
+                                unsigned long size, uint32_t page_flags)
 {
        struct ttm_tt *tt;
 
@@ -209,7 +208,7 @@ static struct ttm_tt *mgag200_ttm_tt_create(struct ttm_bo_device *bdev,
        if (tt == NULL)
                return NULL;
        tt->func = &mgag200_tt_backend_func;
-       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(tt, bdev, size, page_flags)) {
                kfree(tt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 80fa68d..5c01ccf 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -605,18 +605,18 @@ nouveau_bo_wr32(struct nouveau_bo *nvbo, unsigned index, u32 val)
 
 static struct ttm_tt *
 nouveau_ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
-                     uint32_t page_flags, struct page *dummy_read)
+                     uint32_t page_flags)
 {
 #if IS_ENABLED(CONFIG_AGP)
        struct nouveau_drm *drm = nouveau_bdev(bdev);
 
        if (drm->agp.bridge) {
                return ttm_agp_tt_create(bdev, drm->agp.bridge, size,
-                                        page_flags, dummy_read);
+                                        page_flags);
        }
 #endif
 
-       return nouveau_sgdma_create_ttm(bdev, size, page_flags, dummy_read);
+       return nouveau_sgdma_create_ttm(bdev, size, page_flags);
 }
 
 static int

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index 11f6ca8..87b0304 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -83,8 +83,7 @@ static struct ttm_backend_func nv50_sgdma_backend = {
 
 struct ttm_tt *
 nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
-                        unsigned long size, uint32_t page_flags,
-                        struct page *dummy_read_page)
+                        unsigned long size, uint32_t page_flags)
 {
        struct nouveau_drm *drm = nouveau_bdev(bdev);
        struct nouveau_sgdma_be *nvbe;
@@ -98,7 +97,7 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
        else
                nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 
-       if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
+       if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags))
                /*
                 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
                 * and thus our nouveau_sgdma_destroy() hook, so we don't need

diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.h b/drivers/gpu/drm/nouveau/nouveau_ttm.h
index 96082b6..64e484e 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.h
@@ -13,8 +13,7 @@ extern const struct ttm_mem_type_manager_func nouveau_gart_manager;
 extern const struct ttm_mem_type_manager_func nv04_gart_manager;
 
 struct ttm_tt *nouveau_sgdma_create_ttm(struct ttm_bo_device *,
-                                       unsigned long size, u32 page_flags,
-                                       struct page *dummy_read_page);
+                                       unsigned long size, u32 page_flags);
 
 int  nouveau_ttm_init(struct nouveau_drm *drm);
 void nouveau_ttm_fini(struct nouveau_drm *drm);

diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 07d4f3f..2ad70eb 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -292,8 +292,7 @@ static struct ttm_backend_func qxl_backend_func = {
 };
 
 static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
-                                       unsigned long size, uint32_t page_flags,
-                                       struct page *dummy_read_page)
+                                       unsigned long size, uint32_t page_flags)
 {
        struct qxl_device *qdev;
        struct qxl_ttm_tt *gtt;
@@ -304,8 +303,7 @@ static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
                return NULL;
        gtt->ttm.ttm.func = &qxl_backend_func;
        gtt->qdev = qdev;
-       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
-                           dummy_read_page)) {
+       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
                kfree(gtt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index c50620a..009f55a 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -687,8 +687,7 @@ static struct ttm_backend_func radeon_backend_func = {
 };
 
 static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
-                                   unsigned long size, uint32_t page_flags,
-                                   struct page *dummy_read_page)
+                                   unsigned long size, uint32_t page_flags)
 {
        struct radeon_device *rdev;
        struct radeon_ttm_tt *gtt;
@@ -697,7 +696,7 @@ static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
 #if IS_ENABLED(CONFIG_AGP)
        if (rdev->flags & RADEON_IS_AGP) {
                return ttm_agp_tt_create(bdev, rdev->ddev->agp->bridge,
-                                        size, page_flags, dummy_read_page);
+                                        size, page_flags);
        }
 #endif
 
@@ -707,7 +706,7 @@ static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
        }
        gtt->ttm.ttm.func = &radeon_backend_func;
        gtt->rdev = rdev;
-       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
                kfree(gtt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
index 3e795a0..f7c2aef 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_agp_backend.c
+++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -50,6 +50,7 @@ struct ttm_agp_backend {
 static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
 {
        struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+       struct page *dummy_read_page = ttm->bdev->glob->dummy_read_page;
        struct drm_mm_node *node = bo_mem->mm_node;
        struct agp_memory *mem;
        int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
@@ -64,7 +65,7 @@ static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
                struct page *page = ttm->pages[i];
 
                if (!page)
-                       page = ttm->dummy_read_page;
+                       page = dummy_read_page;
 
                mem->pages[mem->page_count++] = page;
        }
@@ -111,8 +112,7 @@ static struct ttm_backend_func ttm_agp_func = {
 
 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
                                 struct agp_bridge_data *bridge,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page)
+                                unsigned long size, uint32_t page_flags)
 {
        struct ttm_agp_backend *agp_be;
 
@@ -124,7 +124,7 @@ struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
        agp_be->bridge = bridge;
        agp_be->ttm.func = &ttm_agp_func;
 
-       if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags)) {
                kfree(agp_be);
                return NULL;
        }

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index fe4aef6..5502874 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -228,7 +228,6 @@ EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 {
        struct ttm_bo_device *bdev = bo->bdev;
-       struct ttm_bo_global *glob = bdev->glob;
        int ret = 0;
        uint32_t page_flags = 0;
 
@@ -247,14 +246,13 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
                        page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
        case ttm_bo_type_kernel:
                bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
-                                                     page_flags, glob->dummy_read_page);
+                                                     page_flags);
                if (unlikely(bo->ttm == NULL))
                        ret = -ENOMEM;
                break;
        case ttm_bo_type_sg:
                bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
-                                                     page_flags | TTM_PAGE_FLAG_SG,
-                                                     glob->dummy_read_page);
+                                                     page_flags | TTM_PAGE_FLAG_SG);
                if (unlikely(bo->ttm == NULL)) {
                        ret = -ENOMEM;
                        break;

diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 5d8f7f9..f93cd10 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -191,14 +191,12 @@ void ttm_tt_destroy(struct ttm_tt *ttm)
 }
 
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
-               unsigned long size, uint32_t page_flags,
-               struct page *dummy_read_page)
+               unsigned long size, uint32_t page_flags)
 {
        ttm->bdev = bdev;
        ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
        ttm->caching_state = tt_cached;
        ttm->page_flags = page_flags;
-       ttm->dummy_read_page = dummy_read_page;
        ttm->state = tt_unpopulated;
        ttm->swap_storage = NULL;
 
@@ -219,8 +217,7 @@ void ttm_tt_fini(struct ttm_tt *ttm)
 EXPORT_SYMBOL(ttm_tt_fini);
 
 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-               unsigned long size, uint32_t page_flags,
-               struct page *dummy_read_page)
+                   unsigned long size, uint32_t page_flags)
 {
        struct ttm_tt *ttm = &ttm_dma->ttm;
 
@@ -228,7 +225,6 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
        ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
        ttm->caching_state = tt_cached;
        ttm->page_flags = page_flags;
-       ttm->dummy_read_page = dummy_read_page;
        ttm->state = tt_unpopulated;
        ttm->swap_storage = NULL;
 

diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
index 1cde060..ee9839f 100644 (file)
--- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
@@ -326,8 +326,7 @@ static struct ttm_backend_func virtio_gpu_backend_func = {
 
 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
                                               unsigned long size,
-                                              uint32_t page_flags,
-                                              struct page *dummy_read_page)
+                                              uint32_t page_flags)
 {
        struct virtio_gpu_device *vgdev;
        struct virtio_gpu_ttm_tt *gtt;
@@ -338,8 +337,7 @@ static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
                return NULL;
        gtt->ttm.ttm.func = &virtio_gpu_backend_func;
        gtt->vgdev = vgdev;
-       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
-                           dummy_read_page)) {
+       if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags)) {
                kfree(gtt);
                return NULL;
        }

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
index 22231bc..fead3f2 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -694,8 +694,7 @@ static struct ttm_backend_func vmw_ttm_func = {
 };
 
 static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page)
+                                unsigned long size, uint32_t page_flags)
 {
        struct vmw_ttm_tt *vmw_be;
        int ret;
@@ -709,11 +708,9 @@ static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
        vmw_be->mob = NULL;
 
        if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
-               ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags,
-                                     dummy_read_page);
+               ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags);
        else
-               ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags,
-                                 dummy_read_page);
+               ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags);
        if (unlikely(ret != 0))
                goto out_no_init;
 

diff --git a/drivers/staging/vboxvideo/vbox_ttm.c b/drivers/staging/vboxvideo/vbox_ttm.c
index c4b7a6b..d1a211b 100644 (file)
--- a/drivers/staging/vboxvideo/vbox_ttm.c
+++ b/drivers/staging/vboxvideo/vbox_ttm.c
@@ -195,8 +195,7 @@ static struct ttm_backend_func vbox_tt_backend_func = {
 
 static struct ttm_tt *vbox_ttm_tt_create(struct ttm_bo_device *bdev,
                                         unsigned long size,
-                                        u32 page_flags,
-                                        struct page *dummy_read_page)
+                                        u32 page_flags)
 {
        struct ttm_tt *tt;
 
@@ -205,7 +204,7 @@ static struct ttm_tt *vbox_ttm_tt_create(struct ttm_bo_device *bdev,
                return NULL;
 
        tt->func = &vbox_tt_backend_func;
-       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+       if (ttm_tt_init(tt, bdev, size, page_flags)) {
                kfree(tt);
                return NULL;
        }

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 0e4ae26..b338dd0 100644 (file)
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -100,7 +100,6 @@ enum ttm_caching_state {
  * @bdev: Pointer to a struct ttm_bo_device.
  * @func: Pointer to a struct ttm_backend_func that describes
  * the backend methods.
- * @dummy_read_page: Page to map where the ttm_tt page array contains a NULL
  * pointer.
  * @pages: Array of pages backing the data.
  * @num_pages: Number of pages in the page array.
@@ -118,7 +117,6 @@ enum ttm_caching_state {
 struct ttm_tt {
        struct ttm_bo_device *bdev;
        struct ttm_backend_func *func;
-       struct page *dummy_read_page;
        struct page **pages;
        uint32_t page_flags;
        unsigned long num_pages;
@@ -331,7 +329,6 @@ struct ttm_bo_driver {
         * @bdev: pointer to a struct ttm_bo_device:
         * @size: Size of the data needed backing.
         * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
-        * @dummy_read_page: See struct ttm_bo_device.
         *
         * Create a struct ttm_tt to back data with system memory pages.
         * No pages are actually allocated.
@@ -340,8 +337,7 @@ struct ttm_bo_driver {
         */
        struct ttm_tt *(*ttm_tt_create)(struct ttm_bo_device *bdev,
                                        unsigned long size,
-                                       uint32_t page_flags,
-                                       struct page *dummy_read_page);
+                                       uint32_t page_flags);
 
        /**
         * ttm_tt_populate
@@ -621,7 +617,6 @@ ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask)
  * @bdev: pointer to a struct ttm_bo_device:
  * @size: Size of the data needed backing.
  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
- * @dummy_read_page: See struct ttm_bo_device.
  *
  * Create a struct ttm_tt to back data with system memory pages.
  * No pages are actually allocated.
@@ -629,11 +624,9 @@ ttm_flag_masked(uint32_t *old, uint32_t new, uint32_t mask)
  * NULL: Out of memory.
  */
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
-               unsigned long size, uint32_t page_flags,
-               struct page *dummy_read_page);
+               unsigned long size, uint32_t page_flags);
 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
-                   unsigned long size, uint32_t page_flags,
-                   struct page *dummy_read_page);
+                   unsigned long size, uint32_t page_flags);
 
 /**
  * ttm_tt_fini
@@ -1080,7 +1073,6 @@ extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
  * @bridge: The agp bridge this device is sitting on.
  * @size: Size of the data needed backing.
  * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
- * @dummy_read_page: See struct ttm_bo_device.
  *
  *
  * Create a TTM backend that uses the indicated AGP bridge as an aperture
@@ -1089,8 +1081,7 @@ extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
  */
 struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
                                 struct agp_bridge_data *bridge,
-                                unsigned long size, uint32_t page_flags,
-                                struct page *dummy_read_page);
+                                unsigned long size, uint32_t page_flags);
 int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
 void ttm_agp_tt_unpopulate(struct ttm_tt *ttm);
 #endif