linux-kernel - [PATCH] drm/udl: dma-buf: Constify dma_buf

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Date:   Sat,  1 Jul 2017 18:06:46 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     airlied@...hat.com, airlied@...ux.ie, daniel.vetter@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/udl: dma-buf: Constify dma_buf_ops structures.

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
   2002	    112	      0	   2114	    842	drivers/gpu/drm/udl/udl_dmabuf.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   2114	      0	      0	   2114	    842	drivers/gpu/drm/udl/udl_dmabuf.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 drivers/gpu/drm/udl/udl_dmabuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c
index ed0e636..61a5a5f 100644
--- a/drivers/gpu/drm/udl/udl_dmabuf.c
+++ b/drivers/gpu/drm/udl/udl_dmabuf.c
@@ -186,7 +186,7 @@ static int udl_dmabuf_mmap(struct dma_buf *dma_buf,
 	return -EINVAL;
 }

-static struct dma_buf_ops udl_dmabuf_ops = {
+static const struct dma_buf_ops udl_dmabuf_ops = {
 	.attach			= udl_attach_dma_buf,
 	.detach			= udl_detach_dma_buf,
 	.map_dma_buf		= udl_map_dma_buf,
-- 
2.7.4