linux-kernel - [PATCH 1/4] soc: mediatek: pwrap: Constify struct pmic_wrapper

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Date: Sat, 29 Jun 2024 11:19:30 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	fparent@...libre.com,
	fchiby@...libre.com,
	s.hauer@...gutronix.de
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 1/4] soc: mediatek: pwrap: Constify struct pmic_wrapper_type

'struct pmic_wrapper_type' is not modified in this driver.

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

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  45336	   8724	     16	  54076	   d33c	drivers/soc/mediatek/mtk-pmic-wrap.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  45528	   8532	     16	  54076	   d33c	drivers/soc/mediatek/mtk-pmic-wrap.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested-only
---
 drivers/soc/mediatek/mtk-pmic-wrap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c
index efd9cae212dc..0da0cdec5050 100644
--- a/drivers/soc/mediatek/mtk-pmic-wrap.c
+++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
@@ -2397,7 +2397,7 @@ static const struct pmic_wrapper_type pwrap_mt8183 = {
 	.init_soc_specific = pwrap_mt8183_init_soc_specific,
 };
 
-static struct pmic_wrapper_type pwrap_mt8195 = {
+static const struct pmic_wrapper_type pwrap_mt8195 = {
 	.regs = mt8195_regs,
 	.type = PWRAP_MT8195,
 	.arb_en_all = 0x777f, /* NEED CONFIRM */
@@ -2423,7 +2423,7 @@ static const struct pmic_wrapper_type pwrap_mt8365 = {
 	.init_soc_specific = NULL,
 };
 
-static struct pmic_wrapper_type pwrap_mt8516 = {
+static const struct pmic_wrapper_type pwrap_mt8516 = {
 	.regs = mt8516_regs,
 	.type = PWRAP_MT8516,
 	.arb_en_all = 0xff,
@@ -2435,7 +2435,7 @@ static struct pmic_wrapper_type pwrap_mt8516 = {
 	.init_soc_specific = NULL,
 };
 
-static struct pmic_wrapper_type pwrap_mt8186 = {
+static const struct pmic_wrapper_type pwrap_mt8186 = {
 	.regs = mt8186_regs,
 	.type = PWRAP_MT8186,
 	.arb_en_all = 0xfb27f,
-- 
2.45.2