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* [PATCH] media: vb2 dma-sg: Constify dma_buf_ops structures.
@ 2017-07-01 12:18 ` Arvind Yadav
  2017-07-04  5:23   ` Marek Szyprowski
  0 siblings, 1 reply; 2+ messages in thread
From: Arvind Yadav @ 2017-07-01 12:18 UTC (permalink / raw)
  To: pawel, m.szyprowski, kyungmin.park, mchehab; +Cc: linux-media, linux-kernel

dma_buf_ops are not supposed to change at runtime. All functions
working with dma_buf_ops provided by <linux/dma-buf.h> work with
const dma_buf_ops. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   5238	    112	      4	   5354	   14ea drivers/media/v4l2-core/videobuf2-dma-sg.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   5358	      0	      4	   5362	   14f2 drivers/media/v4l2-core/videobuf2-dma-sg.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/media/v4l2-core/videobuf2-dma-sg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index 8e8798a..f8b4643 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -500,7 +500,7 @@ static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
 	return vb2_dma_sg_mmap(dbuf->priv, vma);
 }
 
-static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
+static const struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
 	.attach = vb2_dma_sg_dmabuf_ops_attach,
 	.detach = vb2_dma_sg_dmabuf_ops_detach,
 	.map_dma_buf = vb2_dma_sg_dmabuf_ops_map,
-- 
2.7.4

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] media: vb2 dma-sg: Constify dma_buf_ops structures.
  2017-07-01 12:18 ` [PATCH] media: vb2 dma-sg: Constify dma_buf_ops structures Arvind Yadav
@ 2017-07-04  5:23   ` Marek Szyprowski
  0 siblings, 0 replies; 2+ messages in thread
From: Marek Szyprowski @ 2017-07-04  5:23 UTC (permalink / raw)
  To: Arvind Yadav, pawel, kyungmin.park, mchehab; +Cc: linux-media, linux-kernel

Hi Arvind,

On 2017-07-01 14:18, Arvind Yadav wrote:
> dma_buf_ops are not supposed to change at runtime. All functions
> working with dma_buf_ops provided by <linux/dma-buf.h> work with
> const dma_buf_ops. So mark the non-const structs as const.
>
> File size before:
>     text	   data	    bss	    dec	    hex	filename
>     5238	    112	      4	   5354	   14ea drivers/media/v4l2-core/videobuf2-dma-sg.o
>
> File size After adding 'const':
>     text	   data	    bss	    dec	    hex	filename
>     5358	      0	      4	   5362	   14f2 drivers/media/v4l2-core/videobuf2-dma-sg.o
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
>   drivers/media/v4l2-core/videobuf2-dma-sg.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
> index 8e8798a..f8b4643 100644
> --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
> +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
> @@ -500,7 +500,7 @@ static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
>   	return vb2_dma_sg_mmap(dbuf->priv, vma);
>   }
>   
> -static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
> +static const struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
>   	.attach = vb2_dma_sg_dmabuf_ops_attach,
>   	.detach = vb2_dma_sg_dmabuf_ops_detach,
>   	.map_dma_buf = vb2_dma_sg_dmabuf_ops_map,

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2017-07-04  5:23 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2017-07-01 12:18 ` [PATCH] media: vb2 dma-sg: Constify dma_buf_ops structures Arvind Yadav
2017-07-04  5:23   ` Marek Szyprowski

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