linux-kernel - [PATCH] tee: tee_shm: Constify dma_buf

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Message-Id: <4fa3727c8a72f01b25081162de3e3ada0356c01d.1498911878.git.arvind.yadav.cs@gmail.com>
Date:   Sat,  1 Jul 2017 17:56:06 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     jens.wiklander@...aro.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] tee: tee_shm: 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
   2026	    112	      0	   2138	    85a	drivers/tee/tee_shm.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   2138	      0	      0	   2138	    85a	drivers/tee/tee_shm.o

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

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index d356d7f0..4bc7956 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -80,7 +80,7 @@ static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
 			       size, vma->vm_page_prot);
 }

-static struct dma_buf_ops tee_shm_dma_buf_ops = {
+static const struct dma_buf_ops tee_shm_dma_buf_ops = {
 	.map_dma_buf = tee_shm_op_map_dma_buf,
 	.unmap_dma_buf = tee_shm_op_unmap_dma_buf,
 	.release = tee_shm_op_release,
-- 
2.7.4