linux-kernel - Re: [PATCH][next] thermal: lvts: make some read-only arrays static const

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Date:   Tue, 17 Oct 2023 19:54:25 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Colin Ian King <colin.i.king@...il.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Lukasz Luba <lukasz.luba@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] thermal: lvts: make some read-only arrays static
 const


Hi Colin,

On 17/10/2023 19:16, Colin Ian King wrote:
> Don't populate the read-only arrays on the stack, instead make them
> static const. 

Why ?

> Make lvts_write_config parameters cmds and nr_cmds
> const too.
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>   drivers/thermal/mediatek/lvts_thermal.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
> index 877a0e5ac3fd..b20e69cb466f 100644
> --- a/drivers/thermal/mediatek/lvts_thermal.c
> +++ b/drivers/thermal/mediatek/lvts_thermal.c
> @@ -308,7 +308,7 @@ static int lvts_get_temp(struct thermal_zone_device *tz, int *temp)
>   
>   static void lvts_update_irq_mask(struct lvts_ctrl *lvts_ctrl)
>   {
> -	u32 masks[] = {
> +	static const u32 masks[] = {
>   		LVTS_MONINT_OFFSET_SENSOR0,
>   		LVTS_MONINT_OFFSET_SENSOR1,
>   		LVTS_MONINT_OFFSET_SENSOR2,
> @@ -400,7 +400,7 @@ static irqreturn_t lvts_ctrl_irq_handler(struct lvts_ctrl *lvts_ctrl)
>   {
>   	irqreturn_t iret = IRQ_NONE;
>   	u32 value;
> -	u32 masks[] = {
> +	static const u32 masks[] = {
>   		LVTS_INT_SENSOR0,
>   		LVTS_INT_SENSOR1,
>   		LVTS_INT_SENSOR2,
> @@ -781,7 +781,7 @@ static int lvts_ctrl_init(struct device *dev, struct lvts_domain *lvts_td,
>    * each write in the configuration register must be separated by a
>    * delay of 2 us.
>    */
> -static void lvts_write_config(struct lvts_ctrl *lvts_ctrl, u32 *cmds, int nr_cmds)
> +static void lvts_write_config(struct lvts_ctrl *lvts_ctrl, const u32 *cmds, const int nr_cmds)
>   {
>   	int i;
>   
> @@ -865,7 +865,8 @@ static int lvts_ctrl_set_enable(struct lvts_ctrl *lvts_ctrl, int enable)
>   
>   static int lvts_ctrl_connect(struct device *dev, struct lvts_ctrl *lvts_ctrl)
>   {
> -	u32 id, cmds[] = { 0xC103FFFF, 0xC502FF55 };
> +	u32 id;
> +	static const u32 cmds[] = { 0xC103FFFF, 0xC502FF55 };
>   
>   	lvts_write_config(lvts_ctrl, cmds, ARRAY_SIZE(cmds));
>   
> @@ -889,7 +890,7 @@ static int lvts_ctrl_initialize(struct device *dev, struct lvts_ctrl *lvts_ctrl)
>   	/*
>   	 * Write device mask: 0xC1030000
>   	 */
> -	u32 cmds[] = {
> +	static const u32 cmds[] = {
>   		0xC1030E01, 0xC1030CFC, 0xC1030A8C, 0xC103098D, 0xC10308F1,
>   		0xC10307A6, 0xC10306B8, 0xC1030500, 0xC1030420, 0xC1030300,
>   		0xC1030030, 0xC10300F6, 0xC1030050, 0xC1030060, 0xC10300AC,

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