linux-kernel - [PATCH] media: platform: allegro-dvt: Constify struct regmap

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Message-ID: <01b9b16b2f86f4d16d9871a29dcda9245512a1f7.1714894086.git.christophe.jaillet@wanadoo.fr>
Date: Sun,  5 May 2024 09:28:25 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Michael Tretter <m.tretter@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-media@...r.kernel.org
Subject: [PATCH] media: platform: allegro-dvt: Constify struct regmap_config

'allegro_regmap_config' and 'allegro_sram_config' are not modified in this
diver and are only used as a const struct regmap_config.

Constifying these structures moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
   text	   data	    bss	    dec	    hex	filename
  79587	   3706	    116	  83409	  145d1	drivers/media/platform/allegro-dvt/allegro-core.o

After:
   text	   data	    bss	    dec	    hex	filename
  80219	   3066	    116	  83401	  145c9	drivers/media/platform/allegro-dvt/allegro-core.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/media/platform/allegro-dvt/allegro-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/allegro-dvt/allegro-core.c b/drivers/media/platform/allegro-dvt/allegro-core.c
index da61f9beb6b4..1a19fef62e81 100644
--- a/drivers/media/platform/allegro-dvt/allegro-core.c
+++ b/drivers/media/platform/allegro-dvt/allegro-core.c
@@ -179,7 +179,7 @@ struct allegro_dev {
 	struct list_head channels;
 };
 
-static struct regmap_config allegro_regmap_config = {
+static const struct regmap_config allegro_regmap_config = {
 	.name = "regmap",
 	.reg_bits = 32,
 	.val_bits = 32,
@@ -188,7 +188,7 @@ static struct regmap_config allegro_regmap_config = {
 	.cache_type = REGCACHE_NONE,
 };
 
-static struct regmap_config allegro_sram_config = {
+static const struct regmap_config allegro_sram_config = {
 	.name = "sram",
 	.reg_bits = 32,
 	.val_bits = 32,
-- 
2.45.0