linux-kernel - [PATCH 2/4] soc: mediatek: pwrap: Constify some struct int[]

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Date: Sat, 29 Jun 2024 11:19:31 +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 2/4] soc: mediatek: pwrap: Constify some struct int[]

These arrays are 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
  45528	   8532	     16	  54076	   d33c	drivers/soc/mediatek/mtk-pmic-wrap.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  52664	   1384	     16	  54064	   d330	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 | 30 ++++++++++++++--------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c
index 0da0cdec5050..d57553486383 100644
--- a/drivers/soc/mediatek/mtk-pmic-wrap.c
+++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
@@ -483,7 +483,7 @@ enum pwrap_regs {
 	PWRAP_MSB_FIRST,
 };
 
-static int mt2701_regs[] = {
+static const int mt2701_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -569,7 +569,7 @@ static int mt2701_regs[] = {
 	[PWRAP_ADC_RDATA_ADDR2] =	0x154,
 };
 
-static int mt6765_regs[] = {
+static const int mt6765_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -601,7 +601,7 @@ static int mt6765_regs[] = {
 	[PWRAP_DCM_DBC_PRD] =		0x1E0,
 };
 
-static int mt6779_regs[] = {
+static const int mt6779_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -640,7 +640,7 @@ static int mt6779_regs[] = {
 	[PWRAP_WACS2_VLDCLR] =		0xC28,
 };
 
-static int mt6795_regs[] = {
+static const int mt6795_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -725,7 +725,7 @@ static int mt6795_regs[] = {
 	[PWRAP_EXT_CK] =		0x14c,
 };
 
-static int mt6797_regs[] = {
+static const int mt6797_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -758,7 +758,7 @@ static int mt6797_regs[] = {
 	[PWRAP_DCM_DBC_PRD] =		0x1D4,
 };
 
-static int mt6873_regs[] = {
+static const int mt6873_regs[] = {
 	[PWRAP_INIT_DONE2] =		0x0,
 	[PWRAP_TIMER_EN] =		0x3E0,
 	[PWRAP_INT_EN] =		0x448,
@@ -769,7 +769,7 @@ static int mt6873_regs[] = {
 	[PWRAP_WACS2_RDATA] =		0xCA8,
 };
 
-static int mt7622_regs[] = {
+static const int mt7622_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -881,7 +881,7 @@ static int mt7622_regs[] = {
 	[PWRAP_SPI2_CTRL] =		0x244,
 };
 
-static int mt8135_regs[] = {
+static const int mt8135_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -954,7 +954,7 @@ static int mt8135_regs[] = {
 	[PWRAP_DCM_DBC_PRD] =		0x160,
 };
 
-static int mt8173_regs[] = {
+static const int mt8173_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -1036,7 +1036,7 @@ static int mt8173_regs[] = {
 	[PWRAP_DCM_DBC_PRD] =		0x148,
 };
 
-static int mt8183_regs[] = {
+static const int mt8183_regs[] = {
 	[PWRAP_MUX_SEL] =			0x0,
 	[PWRAP_WRAP_EN] =			0x4,
 	[PWRAP_DIO_EN] =			0x8,
@@ -1087,7 +1087,7 @@ static int mt8183_regs[] = {
 	[PWRAP_WACS2_VLDCLR] =			0xC28,
 };
 
-static int mt8195_regs[] = {
+static const int mt8195_regs[] = {
 	[PWRAP_INIT_DONE2] =		0x0,
 	[PWRAP_STAUPD_CTRL] =		0x4C,
 	[PWRAP_TIMER_EN] =		0x3E4,
@@ -1104,7 +1104,7 @@ static int mt8195_regs[] = {
 	[PWRAP_WACS2_RDATA] =		0x8A8,
 };
 
-static int mt8365_regs[] = {
+static const int mt8365_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -1166,7 +1166,7 @@ static int mt8365_regs[] = {
 	[PWRAP_WDT_SRC_EN_1] =		0xf8,
 };
 
-static int mt8516_regs[] = {
+static const int mt8516_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -1251,7 +1251,7 @@ static int mt8516_regs[] = {
 	[PWRAP_MSB_FIRST] =		0x170,
 };
 
-static int mt8186_regs[] = {
+static const int mt8186_regs[] = {
 	[PWRAP_MUX_SEL] =		0x0,
 	[PWRAP_WRAP_EN] =		0x4,
 	[PWRAP_DIO_EN] =		0x8,
@@ -1377,7 +1377,7 @@ struct pmic_wrapper {
 };
 
 struct pmic_wrapper_type {
-	int *regs;
+	const int *regs;
 	enum pwrap_type type;
 	u32 arb_en_all;
 	u32 int_en_all;
-- 
2.45.2