linux-kernel - [PATCH net-next] mlxsw: core_thermal: Constify struct thermal_zone_device

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Message-ID: <4516676973f5adc1cdb76db1691c0f98b6fa6614.1748164348.git.christophe.jaillet@wanadoo.fr>
Date: Sun, 25 May 2025 11:13:17 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Ido Schimmel <idosch@...dia.com>,
	Petr Machata <petrm@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	netdev@...r.kernel.org
Subject: [PATCH net-next] mlxsw: core_thermal: Constify struct thermal_zone_device_ops

'struct thermal_zone_device_ops' are not modified in this driver.

Constifying these structures moves some data to a read-only section, so
increases overall security, especially when the structure holds some
function pointers.

While at it, also constify a struct thermal_zone_params.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  24899	   8036	      0	  32935	   80a7	drivers/net/ethernet/mellanox/mlxsw/core_thermal.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  25379	   7556	      0	  32935	   80a7	drivers/net/ethernet/mellanox/mlxsw/core_thermal.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only,
---
 drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
index e746cd9c68ed..eac9a14a6058 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
@@ -205,11 +205,11 @@ static int mlxsw_thermal_get_temp(struct thermal_zone_device *tzdev,
 	return 0;
 }
 
-static struct thermal_zone_params mlxsw_thermal_params = {
+static const struct thermal_zone_params mlxsw_thermal_params = {
 	.no_hwmon = true,
 };
 
-static struct thermal_zone_device_ops mlxsw_thermal_ops = {
+static const struct thermal_zone_device_ops mlxsw_thermal_ops = {
 	.should_bind = mlxsw_thermal_should_bind,
 	.get_temp = mlxsw_thermal_get_temp,
 };
@@ -252,7 +252,7 @@ static int mlxsw_thermal_module_temp_get(struct thermal_zone_device *tzdev,
 	return 0;
 }
 
-static struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
+static const struct thermal_zone_device_ops mlxsw_thermal_module_ops = {
 	.should_bind	= mlxsw_thermal_module_should_bind,
 	.get_temp	= mlxsw_thermal_module_temp_get,
 };
@@ -280,7 +280,7 @@ static int mlxsw_thermal_gearbox_temp_get(struct thermal_zone_device *tzdev,
 	return 0;
 }
 
-static struct thermal_zone_device_ops mlxsw_thermal_gearbox_ops = {
+static const struct thermal_zone_device_ops mlxsw_thermal_gearbox_ops = {
 	.should_bind	= mlxsw_thermal_module_should_bind,
 	.get_temp	= mlxsw_thermal_gearbox_temp_get,
 };
-- 
2.49.0