Linux Virtualization - Jul 2017 - [PATCH] drm: ttm: virtio-gpu: dma-buf: Constify ttm_place structures.

ttm_place are not supposed to change at runtime. All functions
working with ttm_place provided by <drm/ttm/ttm_placement.h> work
with const ttm_place. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   2315	    184	      0	   2499	    9c3 drivers/gpu/drm/virtio/virtgpu_ttm.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   2347	    152	      0	   2499	    9c3 drivers/gpu/drm/virtio/virtgpu_ttm.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs at gmail.com>
---
 drivers/gpu/drm/virtio/virtgpu_ttm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c
b/drivers/gpu/drm/virtio/virtgpu_ttm.c
index 4e8e27d..012d5bc 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
@@ -234,7 +234,7 @@ static int virtio_gpu_init_mem_type(struct ttm_bo_device
*bdev, uint32_t type,
 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 				struct ttm_placement *placement)
 {
-	static struct ttm_place placements = {
+	static const struct ttm_place placements = {
 		.fpfn  = 0,
 		.lpfn  = 0,
 		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
-- 
2.7.4

On Sun, 2017-07-02 at 13:11 +0530, Arvind Yadav wrote:
> ttm_place are not supposed to change at runtime. All functions
> working with ttm_place provided by <drm/ttm/ttm_placement.h> work
> with const ttm_place. So mark the non-const structs as const.
> 
> File size before:
> ???text	???data	????bss	????dec	????hex	
> filename
> ???2315	????184	??????0	???2499	????9c3
> drivers/gpu/drm/virtio/virtgpu_ttm.o
> 
> File size After adding 'const':
> ???text	???data	????bss	????dec	????hex	
> filename
> ???2347	????152	??????0	???2499	????9c3
> drivers/gpu/drm/virtio/virtgpu_ttm.o
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs at gmail.com>
pushed to drm-misc-next (qxl patch too).

cheers,
  Gerd