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

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Message-Id: <1fcfd1f541f71bf229919e94197716e55e8fd2ad.1498976230.git.arvind.yadav.cs@gmail.com>
Date:   Sun,  2 Jul 2017 11:49:40 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     tomi.valkeinen@...com, airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/omap: 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
   1240	    112	      0	   1352	    548 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   1352	      0	      0	   1352	    548 drivers/gpu/drm/omapdrm/omap_gem_dmabuf.o

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

diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
index 0dbe030..a03bc36 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
@@ -154,7 +154,7 @@ static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
 	return omap_gem_mmap_obj(obj, vma);
 }

-static struct dma_buf_ops omap_dmabuf_ops = {
+static const struct dma_buf_ops omap_dmabuf_ops = {
 	.map_dma_buf = omap_gem_map_dma_buf,
 	.unmap_dma_buf = omap_gem_unmap_dma_buf,
 	.release = omap_gem_dmabuf_release,
-- 
2.7.4