drm: Remove defunct dma_buf_kmap stubs

Since commit 09ea0df ("dma-buf: make map_atomic and map function
pointers optional"), we no longer need to provide stub no-op functions
as the core now provides them directly.

References: 09ea0df ("dma-buf: make map_atomic and map function pointers optional")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180807174748.4503-1-chris@chris-wilson.co.uk

drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c

@@ -339,8 +339,6 @@ static const struct dma_buf_ops amdgpu_dmabuf_ops = {
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
 	.begin_cpu_access = amdgpu_gem_begin_cpu_access,
-	.map = drm_gem_dmabuf_kmap,
-	.unmap = drm_gem_dmabuf_kunmap,
 	.mmap = drm_gem_dmabuf_mmap,
 	.vmap = drm_gem_dmabuf_vmap,
 	.vunmap = drm_gem_dmabuf_vunmap,

drivers/gpu/drm/drm_prime.c

@@ -433,34 +433,6 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
 }
 EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);
 
-/**
- * drm_gem_dmabuf_kmap - map implementation for GEM
- * @dma_buf: buffer to be mapped
- * @page_num: page number within the buffer
- *
- * Not implemented. This can be used as the &dma_buf_ops.map callback.
- */
-void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num)
-{
-	return NULL;
-}
-EXPORT_SYMBOL(drm_gem_dmabuf_kmap);
-
-/**
- * drm_gem_dmabuf_kunmap - unmap implementation for GEM
- * @dma_buf: buffer to be unmapped
- * @page_num: page number within the buffer
- * @addr: virtual address of the buffer
- *
- * Not implemented. This can be used as the &dma_buf_ops.unmap callback.
- */
-void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
-			   void *addr)
-{
-
-}
-EXPORT_SYMBOL(drm_gem_dmabuf_kunmap);
-
 /**
  * drm_gem_dmabuf_mmap - dma_buf mmap implementation for GEM
  * @dma_buf: buffer to be mapped
@@ -489,8 +461,6 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.map_dma_buf = drm_gem_map_dma_buf,
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
-	.map = drm_gem_dmabuf_kmap,
-	.unmap = drm_gem_dmabuf_kunmap,
 	.mmap = drm_gem_dmabuf_mmap,
 	.vmap = drm_gem_dmabuf_vmap,
 	.vunmap = drm_gem_dmabuf_vunmap,

include/drm/drm_prime.h

@@ -93,9 +93,6 @@ void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
 			   enum dma_data_direction dir);
 void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf);
 void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr);
-void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num);
-void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num,
-			   void *addr);
 int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma);
 
 int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,